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Transient Voltage Surge Protection for Electronics

Back in the days of vacuum tube electronics, transient voltage spikes weren’t much of an issue. The continuing process of large-scale integration (LSI) of microchips is another story altogether. Microchip manufacturing has advanced in light speed and now we have very large scale integration (VLSI) of microchips.

There was a time not too many years ago when a 5-megabyte disk drive would crush your foot, should you carelessly drop one. The Honeywell WEB-8000 JACE shown has the astonishing features a 1GHz processor with 1 GB RAM and 4 GB Flash storage. This amazing controller is so light that dropping it on your foot would probably go unnoticed.

VLSI means thousands of electronic ‘components’ separated by microns of insulation.

Image source: Electronics Tutorials

Conventional TVSS equipment serves well on the high, medium, and low-voltage power distribution. Common metal-oxide varistors (MOV) serve very well to suppress transient-voltage surges due to spikes coming into the building from the power lines and they work well down to the 120/208-volt distribution panels.

But not all spikes originate from outside the building. Electrical equipment like motors, electric duct heaters, and other devices can also develop damaging electrical spikes of sufficient magnitude to destroy VLSI microchips. Non-linear loads like variable-frequence drives (VFD), electronic ballasts and the collective switching regulator power supplies in other electronic equipment are major sources of transient damage due to proximity and damaging harmonics.

Sensitive electronics require high-speed tracking surge protection.

Reference drawing: Transient Voltage Surge Protection for Electronics

Our preference for TVSS protection at the electronics enclosure is the EDCO HSP-121-BT-1RU 3-stage hybrid power line protector. This TVSS device is available through several vendors. Here is a cut sheet on this device from PEMCO: HSP121-BT-1RU Cutsheet

How can we be of service to you?

John White

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EMP Protection: Incorporating genuine sustainability for facilities

Electromagnetic Pulse – EMP – of sufficient magnitude can darken an entire continent. Would you want to be on a polar flight during a corona mass ejection – CME – event?

                                                            Image credit:

An EMP from a strategic nuclear attack could darken most of the USA.

The electromagnetic spectrum breaks down to seven classifications. From longest wave length to shortest the classifications are:

  1. Radio waves
  2. Microwaves
  3. Infrared waves
  4. Visible light waves
  5. Ultraviolet waves
  6. X-Rays
  7. Gamma waves 

All electromagnetic radiation is invisible to the human eye, all except the visible light spectrum.

Just below the visible light spectrum is the infrared you sense as radiant heat. At the top of this spectrum, ultraviolet radiation – UVA & UVB – cause skin to tan and very often spawn deadly melanoma skin cancers.

Far beyond ultraviolet radiation are the gamma rays. Gamma rays breakdown into three wavelengths: Alpha (α) radiation is relatively harmless to humans, Beta (β) and Gamma (γ) radiation penetrate human skin to damage all manner of human cells.

As I write, and you read and hear about, destructive electromagnetic pulse (EMP) events. Which of the seven classifications do EMP encompass?

Some describe EMP as electromagnetic soup because these events cover the electromagnetic spectrum from radio (VLF) to ultraviolet.

Lightning strikes are one natural source of EMP. Lightning strikes nominally occur ~100 times per second ( ~8 million per day, ~3 billion per year). Lightning killed 36 U.S. residents in 2016 and caused billions of dollars in damages due to fires, structural damage from shock waves, and destruction of electrical/electronic apparatus by power surges.

Image credit:
Solar CME and solar wind are natural sources of EMP and represent greater risk to mankind than lightning. Fortunately, due to 93 million miles separation between earth and our sun, the irregularity of CME, and the physics of the inverse square law, the probability of our demise by EMP is very low. This is the good news. Now for the bad.

Two nuclear-armed nations threaten to annihilate the United States of America with their nuclear-equipped intercontinental ballistic missiles (ICBM). Military experts anticipate high-altitude explosions from which extremely powerful EMP could disable most of the electrical power distribution networks across America. Is the EMP threat genuine? Learn more via this link: Here again, this is the bad news. Now for the good. The good news is we can dramatically mitigate the risk of EMP strike by a rogue nation by “hardening” our nation’s electrical grids – there are many, two in Texas.

The Rockwall Company can’t protect power grids, but we can protect your stand-alone facility through application of active tracking power filters and transient-voltage surge suppression. The Texas Legislature failed to move forward with a bill proposed by State Senator Bob Hall (SD-2) this year. Hopefully, between now and conclusion of the next legislative session, our enemies delay acting on their threats and sensible and cost-effective actions will be implemented to protect our electrical energy supplies. I think it necessary to warn that one strategically deployed EMP strike would leave as much as 90% of our population dead within one year, according to experts on the subject. On the road to making America great again, let’s not bury our heads in the sand and be proactive in preserving and defending our nation against all enemies, foreign and domestic. How can we help your business or medical facility?

John White
Rockwall Controls Company, Inc.
(972) 771-3514

HVAC Control of Psychometrics, Filtration, & Pressurization in the Prevention of Hospital Acquired Infections (HAI)



Hospitalization exposes patients to an array of HAI. This paper focuses on specific means by which risks of HAI can be minimized. While airborne infectious droplets pose a serious threat to

Clostridium Difficile
In 2015, Approximately 29,000 patients died within 30 days of the initial diagnosis of C. difficile.

hospital patients, employees, vendors, and visitors, I address HAI threats to patients.

Prevalence of HAI

A 2014 HAI study published in the New England Journal of Medicine describes the prevalence and distribution of HAI.

    • 4% of patients had at least 1 healthcare-associated infection
    • Pneumonia and surgical-site infection were most common, followed by gastrointestinal infection, urinary tract infection, and primary bloodstream infection
    • Device-associated infections accounted for 25.6% of all healthcare-associated infections
    • Device-associated infections and surgical-site infections accounted for 47.4% of all healthcare-associated infections
    • 6% of infections were not associated with devices or operative procedures
    • 481 pathogens contribute to 73.8% of HAI
    • More than half of all HAI occur outside ICU.

How great is the problem of HAI? The CDC reported in 2011 the deaths of approximately 75,000 hospitalized patients.

HVAC Processes Employed in the Prevention of HAI

Reference: FINALPUBLISHEDPaperonHUMIDITYandViruses509

Pressurization Control

  • Positive pressurization of surgical and storage areas prevents or limits introduction of airborne pathogens from other spaces.
  • Negative pressurization of isolation rooms prevents the spread of an infected patient’s pathogens to areas outside the isolation room.


The State of Texas has guidelines establishing minimum standards for all areas in hospitals with HVAC service. Refer to Table 3 of Texas DHS Title 25 Texas Administrative Code, Chapter 133, Hospital Licensing Rules for all pertinent regulations.


  • HEPA filters are designed to filter 99.97 percent of particles with a diameter of 0.3 microns. The size of 0.3 microns is the most evasive for a particulate filter. A HEPA filter is more efficient in trapping particles with larger or smaller diameters. When HEPA filters are installed within HVAC systems, they should be chal­lenged with a testing agent to ensure that they are meeting their designed efficiency. Dioctyl phthalate (DOP) is usually used as the challenging agent.  A DOP generator creates aerosols with a mass median diameter of 0.27 microns that are injected into the HVAC system’s airstream, upstream from the filter bank. A light-scattering photometer then determines the penetration of DOP aerosols that occurs through the filter and around its gasket.
  • Refer to ASHRAE Standard 170-2013 to select the proper level of filtration.

Source: American Society for Healthcare Engineers

Temperature and Relative Humidity Control

  • Maintaining temperatures above 60°C (140°F) for more than 60 min. will usually inactivate most viruses, though this can vary depending on the presence of organic material (e.g. blood, feces, mucus, saliva, etc.) that may surround exhaled viral particles and insulate the virus against extreme environmental changes. Higher temperatures for shorter times can be just as effective to inactivate viruses (Tang 2009). Obviously, only Superman or Supergirl could withstand such high temperature.
  • Relative humidity (RH) works in tandem with air velocity (discussed below) to suspend infectious aerosols produced by talking, vomiting, diarrhea, toilet use, breathing, and coughing.
  • Temperature and relative humidity operating ranges shall be specified by the authority having jurisdiction.

Air Movement Velocity and Room Air Change Rates

Why is air velocity an important factor? Allow this introduction to the concepts of viscosity and  Stoke’s Law:

Viscosity simply described is resistance to flow. NASA says viscosity is the “sticky” property of air. The “stickier” the air, the slower infectious aerosols (droplets) will fall through the air. If the upward velocity of air in a space is greater than the settling or terminal velocity of the aerosol, the aerosol will not fall all the way down to a patient or onto a sterile surface below.

The larger the droplet, the faster it falls and therefore upward air movement toward the return-air path is of utmost importance.

The actual cost of implementation of all the above is extremely low in comparison to the cost of patient fatalities due to HAI.

In most hospitals, HVAC electrical cost is typically around 52% of the total. Therefore, operating efficiency is important, but of higher priority is a healthy indoor environment that minimizes Hospital Acquired Infections (HAI).

The Rockwall Company stands ready to help your medical facility comply with Texas state standards and superior operating efficiency.

How may we help you?

John White
(972) 771-3514

Airtight Buildings – When the cure can be worse than the disease

Older buildings were built to conform to a number of free-market ideas, like low cost-per-square-foot, competitive rental space, and basic by-low-sell-high economics.

I remember how the Arab oil embargo of 1973 changed how America would do business. For example, full-service gas stations became self-service almost overnight. I left the aerospace business in 1974 to start a new career in building controls.

Naturally, the federal government focused on a nationwide campaign to force us to use less motor fuel. The feds blackmailed states by threatening to withhold federal highway funds to create a national speed limit of 55 MPH. The lower speed limit naturally inspired motorists like me to purchase CB radios because those of us who live outside the Washington DC Beltway who lived in the wide open spaces of southwestern and western states basically would have gone out of business. The distance from my office to a customer in El Paso, Texas is 659 actual road miles. You see the problem.

The feds demanded tighter, more energy efficient buildings. We built them and – voila – a new set of problems arose: health issues due to tight building syndrome. Well, there was a ready-made federal bureaucracy that was signed into law by President Richard Nixon on December 2, 1970, called the Environmental Protection Agency. At this point, follow me on a tangent.

Here in the Great State of Texas, we have a bureaucracy called the Texas Commission on Environmental Quality (TCEQ). What is so significant about the difference between the name of the federal agency and our Texas agency?

Environmental Protection Agency – From whom or what is the agency protecting what or whom?

Texas Commission on Environmental Quality – Do you see it?

Let me break it down for you. The feds have a goal of protecting the environment from human activity, implying we humans are bad for the environment. Our TCEQ has a goal of assuring a quality environment for we the people of the Great State of Texas. Do you see the difference now?

On August 4, 1977, the federal Department of Energy (DOE) was enacted. At this point, please entertain my opinion: neither the EPA nor the DOE is a constitutional prerogative of the federal government. If not among the enumerated powers, all such governance is reserved for the states, as per the Tenth Amendment.

The environmentalist movement was around almost a century before the creation of the EPA and DOE. However, these two agencies gave the movement ‘statutory teeth’ and it is the idea of protecting the environment from people that drive federal regulations today. I now return regular programming from this tangent.

I leave a discussion the evolution of the American Society of Heating and Ventilating Engineers (ASHV) to our present-day American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE) for another day, another topic.

The older buildings were not airtight. Infiltration and exfiltration were common to all buildings. Early interest was ventilation to manage odors (still got to do it) and carbon-dioxide (CO2) concentration (something we still do).

Medical experts discovered how diseases were affecting the occupants of buildings, so the ASHV adopted ventilation rate standards to address this issue. The outcome was greatly increased ventilation. Willis Carrier’s 1902 invention of air conditioning to control relative humidity in printing plant where he worked was the genesis of commercial air conditioning for human comfort. By 1954, the ASHV renamed itself ASHRAE thereby bringing engineered solutions to commercial airconditioning.

Present day energy codes dictate airtight structures with walls impermeable to moisture. This reverses the infiltration/exfiltration problem of older buildings while introducing new problems to new buildings. To be sure, contemporary so-called energy codes are driven by the same idea upon which the EPA was named: radical environmentalism. Due to little or no infiltration, HVAC systems must introduce more outdoor air and this process also introduces outdoor moisture the impermeable wraps prevent. Collectively, the two matters require new HVAC technologies that satisfy the ventilation requirements and also control humidity.

Due to little or no infiltration, HVAC systems must introduce more outdoor air and this process also introduces outdoor moisture the impermeable wraps prevent. Collectively, the two matters require new HVAC technologies that satisfy the ventilation requirements and also control humidity.

The cost for all the new apparatus mandated for new buildings has an obvious effect on total cost of ownership. True, over time there will be savings from energy efficiencies – if they actually work in a particular building. Meanwhile, the upfront high cost of “green” construction affects the cash flow of commercial rental properties and hence the resale value of the commercial building. The value of an office or medical building depends on the profitability of the property, not necessarily the location, location, location.

If you have an older building, should you just demolish it and replace it with a “green” building? Perhaps. Perhaps not.

We have developed techniques to minimize the effects of infiltration and exfiltration using existing HVAC systems by incorporating metrics (measuring stuff) and designing intelligent control systems to maintain those metrics. One cannot control what one does not measure.

One example is a six-story government office building built in 1979. The HVAC system featured approximately 250 high-pressure dual-duct terminals, two 100 HP cold-duct vaneaxial fans, one 75 HP hot-duct vaneaxial fan, and two 45 HP vaneaxial return-air fans. All five fans ran constant-volume and due to high infiltration and exfiltration operated 24/7/365. All HVAC controls were pneumatic.

After running the numbers, the retrofit plan was to convert all 250 dual-duct zones to variable-volume, install variable-frequency drives (VFD) on all fans but the hot-duct fan. The hot duct was needed only for one floor. Precision air-flow measuring stations on return-air fans and the two cold-duct fans, along with incorporation with demand-control ventilation and fan-tracking algorithms, dramatically reduced infiltration and exfiltration. Other benefits included the almost total elimination of hot-and-cold calls, and a reduction in electrical consumption by 50% – kWh, not dollars. Dollars were reduced more than 50% due to increases in electrical rates.

There are other issues like hardening a structure against fire hazards, but I limit the discussion to the above example to say, your older building may be a candidate for creative energy-saving solutions.

Initial site review in the Dallas/Fort Worth Metroplex is available for no charge. Out of town (greater than 60 miles from Rockwall) will be chargeable.

How can we help you?

John White

Rockwall Controls Company, Inc.

(972) 771-3514      office


Which comes first? CO2 or Temperature?

Al Gore and his fellow climate alarmists claim atmospheric temperature rises as carbon dioxide (CO2) atmospheric concentration increases. Is CO2 thechicken‘ or the ‘egg‘? Is it possible the association of temperature to CO2 is opposite to Mr. Gore’s claims?


In the following video, Malcolm Roberts of the Galileo Movement uses grains of rice to provide a perspective on the magnitude of CO2 to the atmosphere as a whole.

Malcolm Roberts is a Senator for Queensland, Australia, holds an MBA and is a mining engineer.

As you learn from Mr. Roberts’ presentation, carbon dioxide is a vital element without which there would be no life on earth. You also learn that CO2 is ‘egg’ to temperature’s ‘chicken’.

Published on Apr 3, 2012

Your Gas Heating Equipment: You May Have a Tiger By the Tail

If you grew up with natural gas heating, you probably never considered potential hazards of explosions or fire.

Read from AP News: Apparent gas leak explosion rips apart dorm

How common are natural gas explosions? Google “natural gas explosions 2017” to get up to date on such events in the first six months of this year.

Methane, CH4, is a widely used fuel for heating, cooking, powering engines in motor vehicles and electrical power generators. It is odorless and tasteless. Likewise, propane (LPG) used in areas not served by natural gas pipelines. On those occasions when you may have smelled a leak, it wasn’t the actual methane or propane gas that tipped off your olfactory senses, but a chemical added to the gas.

With all the above said, those persons responsible for the safe and effective operation of commercial buildings should be held accountable on the issue of preventive maintenance of combustion equipment.

Unlike electrically-powered heating and cooking equipment, natural gas furnaces, boilers feature complex combustion control equipment to prevent life-threatening events like the gas explosion in the above-named university dorm. Use of gas-fired heating equipment typically involves a number of sensors to assure that tiger-by-the-tail stays in his cage. One commonly used name for combustion control equipment is “FLAME SAFEGUARD”. The word safeguard means “something that serves as a protection or defense or that ensures safety”.

Without dragging this discussion into the weeds, the point of all this is to say at least annual inspections by combustion-control specialists is a must. Commercially available combustible gas detectors are also available to alert responsible persons of an imminent danger.

If you wish to test your gas-fired heating equipment, don’t call Rockwall Controls. We do not service such items. This is the usual and customary purview of mechanical service companies.

Basic facts about your combustion control equipment should be known before calling in a technician.

  • What is the fuel? Natural gas, propane, oil?
  • What is the configuration of your ignition equipment? Pilot flame, electric spark ignition, hot-surface igniter?

To emphasize the vital importance of the technician’s qualifications, allow me this real-life example of a homeowner whom I know. The homeowner purchased a large home out in a semi-rural area of Rockwall County. Propane is the fuel.

He purchased a home-owner warranty (HOW) to cover unexpected breakdowns. So it was when his gas-fired furnaces were malfunctioning, he called the number for service.

The problem was simply this: the furnace would attempt to ignite, but it would almost immediately shut down. The technician tried a number of things, replacing this or that components, but the problem persisted. After calling a regular HVAC company to look at the problem, he learned his furnace was configured with orifices used for natural gas (methane), but his house was supplied with propane that requires a much smaller orifice.

All mechanical service companies are not the same. Check references. Ask questions.

If you follow the above sensible advice, your property will most likely stay warm next winter.

John White
Rockwall Controls Company, Inc.
972) 771-3514

Legendary investor Jim Rogers: Western civilization is going to collapse

Mr. Rogers’ wisdom: Do not invest in what you want. It’s better to invest in what’s happening in the world.

If you use the WAZE app while driving as I do, you get advance warning of hazards ahead of you thereby providing time to take alternative action – object on road, pothole ahead, traffic at a standstill.

What I suggest and what I practice is proactive thinking. Unfortunately, we humans tend to linearize our projections into the future.

Here’s stark reality, my friends. All markets go up and down, bubbles and crashes. How long has this been going on? From time immemorial.

Jim Rogers briefly discusses the natural economic cycle which usually goes seven years between bubbles and crashes. The last major crash was 2008, therefore the last crash should have happened almost two years ago. Rogers is simply applying history to his outlook of a crash this year or soon thereafter.

What to do? Instead of linearizing your projections, extrapolate the future with an eye on the past.

Currently, unemployment is greater than it was in 1933 at the lowest point of the Great Depression when unemployment was 25%. According to the Dept. of Labor, the labor participation rate is 62.7% of the able-bodied workforce and this translates to 37.3% actual unemployment.

Thousands of retail stores are closing, but it’s not due to customers not buying what they need and want. It’s a shift in how they buy what they need and want, a shift from storefronts to websites.

Personally, I don’t plan to go under. I’m going over because that is what I am: an overcomer.

Have faith for the future and invest wisely to excel during the next market crash.

Perhaps we can help.

John White
Rockwall Controls Company, Inc.
(972) 771-3514

Tsunami of Science To Your Benefit

Musing on gravity waves, the question of the definition of gravity comes to mind. Is gravity an attraction force? Is it the earth’s gravity that draws material to its surface?

Gravity and the Space-Time Continuum

Or, is it possible observable gravity events are actually the consequence of an outside force pushing material to the surface of the earth?
Dr. Albert Einstein theorized gravity waves in 1916. Proof of his theory came 58 years later on in 1974.

What are gravity waves?


To answer, let’s first examine gravity. Conventional thinking describes gravity as a force of attraction between masses, a force that draws them together. That picture of Newton’s falling apple comes to mind, suggesting the earth draws the apple to earth. We have math to support this concept. But, gravity is actually a force that unites the entire universe. This force is the four-dimensional space-time continuum that binds absolutely everything in the Universe together. Most often, this phenomenon is called a fabric, as a linen sheet or a tee shirt are made of fabrics.
So long as large objects in this space-time continuum remain calm and collected, the fabric of space-time remains stable. The sudden acceleration of a mass distorts the fabric creating waves. Think of a bed sheet undisturbed, wrapping all the objects on your bed, things like pillows, kid toys, that iPad you misplaced last night. If you snap the sheet on one side of the bed, observable waves will be seen across the breadth of the bed. This is my feeble attempt to describe gravity waves.

Where can one observe gravity waves closer to home?


You can observe them along the Pacific ‘rim of fire’. A sudden movement of earthen materials disturbs the space-time continuum resulting in waves of water that can travel thousands of miles before crashing onto a distant shore.
NASA scientists have discovered how tsunamis create gravity waves that cause ripples in the ionosphere hundreds of miles above the surface of the earth. With these observable waves, it will be possible to accurately predict the direction of tsunami waves and thereby warn people to get out of harm’s way.

NASA: Scientists Look to Skies to Improve Tsunami Detection, 17 May 2017

Read: Scientists Look to Skies to Improve Tsunami Detection, published May 17, 2017.
The Bible was scientific long before the birth of Albert Einstein. It says, “For in [God] we live and move and exist.”
Intelligent Design (ID) isn’t a concept of ignorant theorists blinded by religion. ID is a theory supported by scientists throughout the world, many non-religious. Unlike evolutionary-minded scientists who stand on a belief system of atheism, the ID scientists follow the facts to a natural conclusion.
Learn more about peer-reviewed ID scientists via this link:
Rockwall Controls follows the scientific method to detect flaws in indoor environmental control systems and then to provide solutions that optimize building systems.
John White
Rockwall Controls Company, Inc.
Rockwall, Texas 75087

Gas Furnace Or Tiger By The Tail?

Gas furnaces are among the safest HVAC equipment in use anywhere, if all conditions are right.

Because of widespread and common use, building owners take for granted reliable and safe operation.

Let’s compare an electric furnace to its gas-fired counterpart.

Electric Furnaces

Electric furnace safety devices typically include circuit breakers to prevent fires due to short-circuit faults. An air flow switch prevents electric furnace operation when air flow through the furnace heating elements is insufficient. A simple high-temperature cutout serves to kill control power to power contactors if for whatever reason the air flow switch fails or has been tampered with.

The operation of electric heat is simple. Need heat? Turn it on. Don’t need heat? Turn it off.

Gas Furnaces

Gas furnaces feature sophisticated gas valves, combustion air blowers, igniters, flame detectors, high-temperature cutout sensors, complex flame safeguard electronics, a flame rollout sensor, and two air pressure sensors.

tiger by the tailIf all equipment and controls are in proper working order and you need heat, then a complex purge-ignition-combustion sequence starts up. If there are no spider webs, no cracks in the heat exchanger, flue vent is clear, gas pressure regulation is right, then the heat comes to the conditioned space.

What can go wrong? Plenty. There is a good reason for the sophisticated electronics and safety devices. These devices and electronics are in place to protect persons and property from fire, explosions, and carbon-dioxide poisoning of persons within the conditioned spaces.

Leaking heat exchangers can introduce carbon monoxide (CO) into the airstream. CO is a colorless, odorless, deadly gas known as the silent killer. According to the American Council on Science and Health, carbon monoxide kills more Americans than mass shootings.

As though there is nothing more to worry about, think again, this time on the issue of flame rollout. The Fire Science Training Institute wants building owners and consumers to know the danger of flame rollout.

Flame rollout is the term commonly used to describe a fuel gas combustion process occurring outside the normal combustion area of a gas appliance. Any gas combustion not properly confined to the appropriate area could obviously have serious consequences. Electrical wiring, gas valves, and combustible materials located near appliances may be compromised by flame rollout. Flame rollout can cause gas control valves, usually made of metal alloys with relatively low melting points, to fail structurally. Such a failure can be responsible for the release of a devastating volume of gas with a ready source of ignition. – Fire Science Training Institute: Understanding Flame Rollout In Gas Appliances


If the HVAC unit in question has direct-expansion refrigeration, then the electrical service to that unit (typically a rooftop unit) will be adequate to power an electric heater.

In the case of chilled-water systems, electrical service to the air handling unit is only adequate for the fan motor(s) and controls. One solution: Replace a gas furnace with a heating-water coil fed by a standalone gas-fired heating water boiler.

Wish to discuss any of the above issues? Contact us anytime for an appointment.

John White

Rockwall Controls Company, Inc.

(972) 771-3514

Nabber all you want about ‘green’ strategies. In the final analysis, building owners and investors want True Green.

While visiting business recently, an employee showing me around boasted of the green features incorporated into the construction of that particular building. He pointed to the floor tiles and said with a smile, “Our flooring was made of recycled materials.” To myself, I thought to ask, “Do you really believe there is a shortage of dirt?”

At the end of the day or the deal, every solution we provide our customers has to make economic sense.

What are your goals? If you wish to improve the cash flow on your property to raise its value before a sale, we can probably help. If your goal is to elevate operating energy efficiency or fix that nagging HVAC issue, we can probably help there also.

John White
Rockwall Controls Company, Inc.
(972) 7761-3514

Also read from the NAHB: The Average Builder Uses 10 Different Green Products and Practices…/the-average-builder-uses-10-diff…/