HVAC Houston Commercial Air Conditioning
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Houston Area Safety Council

  Serving the Greater Houston Area since 1977  

High-end Luxury Air Conditioning

Residential and commercial HVAC advice, air conditioning preventive maintenance, air conditioning repairs, and replacing air conditioning systems.

HVAC Variable Speed Motors

Today's technology, while being more expensive to purchase up front, can pay for itself over time in energy savings by increasing efficiency. Variable speed blower motors not only increase the efficiency but they also increase your comfort. Conventional HVAC systems are designed to maintain comfort based on a peak load of 95 degrees Fahrenheit out side temperature with 75 degrees Fahrenheit and 50 percent relative humidity inside. That means that even when the temperature outside is 80 degrees Fahrenheit the system will still operate full blast as if it were 95 degrees Fahrenheit outside. Imagine you had a car that only did one speed. Sure it would get you there but how efficient would it be? Both Trane and Carrier HVAC systems have specifically designed systems with variable speed blowers for greater efficiency and humidity removal. Other manufacturers have followed their lead.

Variable speed motors (technically called ECM or Electronically Commutated Motor) along with two-stage compressors and multi-stage furnaces offer better control and efficiency by helping your system run at the speed it needs to run at to meet the current load demand. Temperatures are even and the equipment cycles per hour are reduced. In both the summer and winter the motor runs at a lower speed until the demand increases and then it ramps up to meet that higher demand. It only runs or consumes enough energy to meet the current demand. Other benefits to having variable speed motors are:

  • Soft-start capabilities
  • Quieter operation (research indicates up to 50 percent less noise than conventional blowers).
  • Better humidity control which adds increased comfort in the summer
  • On higher SEER condensing units, variable speed motors are used for the condenser fan motor.
  • When used in conjunction with multi-stage furnaces AFUE ratings increase.


The Infinity™ 80 Variable-Speed, 4-way Multipoise Gas Furnaces offer unmatched comfort with ComfortHeat ™ technology and IdealHumidity™ in an 80% AFUE gas furnace. You get all the benefits of a ComfortHeat technology furnace: reduced drafts, reduced sound levels, longer cycles, less temperature swings between cycles, and less temperature differences
between rooms. With the variable speed blower motor, homeowners can now economically run constant fan to help eliminate temperature differences throughout the house and to get better indoor air quality. This IdealHumidity furnace also increases comfort in the summer by wringing out extra humidity when needed. The Infinity 80 furnaces are approved for use with natural or propane gas, and the 58CVX is also approved for use in Low NOx Air Quality Management Districts.


* Variable-speed blower motor with Comfort-R™ operates at lower, more efficient speeds than conventional blower motors. With Trane’s exclusive Comfort-R™ feature, there is greater humidity control during cooling. Allows
compatibility with higher SEER two-stage outdoor units.
* Adaptive silicon nitride hot surface igniter. Highly reliable ignition system provides longer service life.
* Heavy steel insulated cabinet. Comes in easy-to-install sizes in three industry standard widths; 40" tall. Insulated panels hold more heat in the furnace, ensure greater durability and reduce operating sound.
* Self-diagnostic controls. Complete diagnostics for easy servicing. Also includes a system fault analysis for quick gas flow shutoff, coupled
with automatic ignition retry after sensing a fault mode.
* Easy-access doors (upflow models only). Quarter-turn dual door latches provide quick and easy access for servicing.
* Multi-port in-shot burners. Perfectly shape the flame cone for the maximum heat possible while using less fuel. No service adjustment necessary.

We can assist you with IAQ, indoor air quality, air filtration, filtration, design build, air conditioning service, second opinion, chiller service, chilled water, chilled water piping, hydronic, make up air, energy management systems, load calculation, heat pump, two stage, variable speed, VFD, humidity control, HEPA

Affiliations with heating, ventilation and air conditioning equipment suppliers includes:  CaptiveAire, Inc. commercial kitchen ventilation, Superior Products International II, Inc, (Supertherm, HPC, HSC, Rust Grip, Omega Fire), Lennox, Carrier , Trane, Goodman, Honeywell; and insulation manufacturers Certainteed, Johns Manville, Owens Corning, Knauf



* Preventive Maintenance
* Seasonal Checkups, Filter Change

HVAC System - Component Replacement, Repair and Service
Air Handling Units
Duct Systems
Evaporator Coils
Humidity Control
Condensing Units

Air Conditioning Maintenance, Service, and Repairs

No matter what name brand (York, Trane, Carrier, Rheem) of air conditioning and/or heating unit you purchase some time or the other you will need to have that air conditioning and heating equipment checked for a problem and repaired. Even if you have regular air conditioning maintenance done. While there are air conditioning and heating manufacturers that engineer quality into their air conditioning and heating equipment, that equipment is prone to breakdown simply because it is a mechanical/electrical device and will need repair sometime throughout its useful life. Most of the time diagnosing problems is simple and other times it can be a complicated process where the HVAC technician calls in another HVAC technician or even an HVAC manufacturer representative. Residential and commercial heating and cooling is important and you want the best possible HVAC air conditioning and heating service. It does not matter whether you have a Carrier Air Conditioner, Trane Air Conditioning Units, or need air conditioning or heat pump replacement, it is best to get a qualified technician to look at your system before a decision is made to repair or replace the air conditioner or heat pump systems.

Once a diagnosis is made to your air conditioning and/or heating system, the unit can be repaired, in most situations, with stock HVAC parts off the truck. Sometimes the HVAC part has to be ordered because it is a specialty part that only the HVAC manufacturer of your air conditioning and heating equipment can provide. If the part can be picked up locally then you can expect to pay for travel time to and from the HVAC parts dealer. It is practically impossible to carry every single HVAC part for every single HVAC breakdown that occurs.

Finally, air conditioning and heating maintenance, provided on a regular schedule, can prevent many air conditioner or heater breakdowns thereby preventing the need for you to call an air conditioning and heating repair person for air conditioning and heating troubleshooting. Air Conditioning and heater maintenance can save you lots of money in the long run but even so, problems can still occur.

Common Air Conditioning Preventive Maintenance & Repairs

Air Conditioning Refrigerant Charge

This is a very common air conditioning problem. The air conditioning unit will cool for a few hours and then it stops cooling all together. The next day or several hours later the air conditioning is cooling again but for only a few hours and then the air conditioning stops again. The reason this is happening is because the air conditioning unit is low on refrigerant (the air conditioning unit could freeze because of a few other air conditioning problems but this is the most common reason). Believe it or not the evaporator coils inside the AHU (Air Handling Unit) are freezing. You may notice the air conditioning refrigerant lines on the condenser or at the AHU are frozen with ice build-up. The frost or ice builds up on the coils and blocks air flow (low air flow and no cooling are a sign of a low charge). A low air conditioning refrigerant charge will cause the evaporator coil to operate at or below freezing. Since the coil typically operates below the dew point, it draws condensation out of the air. When the evaporator coil begins operating below freezing all this condensation freezes to the evaporator coil and the unit stops cooling.

Air Conditioning Refrigerant Myth

The myth that most people believe is that if you add more refrigerant to the air conditioning unit it will cool better. This is only true if the evaporator coil is operating below freezing. The air conditioning unit must have a balanced charge and usually only an HVAC professional can charge your air conditioning unit properly. Another misconception about refrigerant is that the air conditioning unit burns it up and it must be replaced from time to time. This is not true. The refrigerant loop is a closed system and barring any leaks the air conditioning system should never need any refrigerant. Click here to see a simple representation of the refrigeration cycle.

Air Conditioning Refrigerant Leaks

Refrigerant leaks should be repaired for the following reasons:

  • Many refrigerants have been deemed hazardous to the atmosphere by the EPA and have either Ozone Depleting Potential (O.D.P.) and/or Global Warming Potential (G.W.P.)
  • Low refrigerant charges hurt the efficiency of the air conditioning unit or heat pump.
  • Low refrigerant charges take away from the life of the air conditioning compressor. The compressor is cooled from the return refrigerant vapor. When there is a low charge there is fewer vapors to cool the compressor therefore it runs hotter. Any air conditioning compressor (or electric motor for that matter) which runs above the recommended temperature range will have a shorter life span and cost more to operate.
  • Typically refrigerant oil leaks out of the air conditioning system at the leak point. Eventually, the oil level in your air conditioning system will drop below safe levels and the air conditioning compressor will sieze up from lack of proper lubrication.

The Refrigeration Loop is a closed system and refrigerant should never have to be added to the air conditioning unit unless there is a leak. Most residential air conditioning units use R-22 refrigerant. Prices of R-22 are rising every year as we get closer to the date when refrigerant manufacturers will no longer be able make R-22. Phase-out of R-22, an HCFC, begins in 2010 and expected to be complete by 2020. Make sure you ask what air conditioning service company charges for R-22 when you are calling an HVAC contractor. If your air conditioning unit needs more than two pounds or charged more than once a year it is recommended you have a refrigerant leak check done to your air conditioning system. You most likely have a serious refrigerant leak and it needs to be repaired. Leaking units do not operate efficiently, take their toll on the environment, and can cause serious HVAC mechanical problems in the future. A good HVAC service tech will attempt to find the refrigerant leak within the hour's air conditioning service you are paying for in addition to the refrigerant charge. Finally, after the air conditioning unit has been properly charged, the air conditioning unit should have a temperature difference between the return and supply of 12° to 20° Fahrenheit (delta T). The range is generally an acceptable practice to determine if your air conditioning system is operating efficiently. If you do not have this range of temperature differential with your air conditioning system then there are problems which need to be addressed whether it is bad duct or a mechanical or electrical issue causing the problem the air conditioning unit is simply not providing the cooling it needs to provide to make you comfortable.

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