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Thermal Expansion Valves: An expansion valve is very uniquely designed device in an air conditioning or heat pump system that controls the super heat to the compressor over a wide range of conditions. So why should you use an expansion valve on an air conditioning or heat pump system versus a capillary tube or other fixed orifice device? We’re glad you asked! The following covers many advantages of using an expansion valve.

Why a 2-stage Coil? All coils are matched to their performance at full cooling capacity and all systems are designed to this balance point. However, the two speed units have a different requirement. The compressor operates at two different speeds. This creates a need to look at the two different balance points of each system.

Coil Corrosion: There are many forms of corrosion. However, the most common form of corrosion associated with HVAC equipment is referred to as galvanic or general corrosion. This type of corrosion can lead to equipment failure.

Evaporator Coil Installation: We select each cooling coil based on the design of your home. This is reflected in the engineering balance point with regard to humidity removal, with maximum performance. This includes an expansion valve, sight glass, and refrigerant charge.

Proper Coil Selection - One of the most misunderstood and most important equipment selections is the coil application. Most contractors' just use what is generally recommended by the manufacturer. Coils are applied about the same in all climates whether dry or humid. This is wrong and results in many calls to our company from people complaining about humid conditions in their house.

Drain Lines and Pans - Your air conditioning system can drain 20 or more gallons of water per day. This water is carried by your drain lines and tied into the house plumbing system or to the outside ground to be drained. Those lines tied into the house plumbing are subject to serious clogging over time.

Coil Cleaning: When you discover severely restricted air flow through a coil during normal service, it may be time to suggest a replacement, since attempting to clean such a coil may only make matters worse.

Duct Systems: A properly designed duct system is just as important as any other component of the system. At Central City Air, we offer our customers three different types of ductwork to meet their needs.

Heater Design: Furnaces should be selected and sized at near 40 to 50 BTUH per square foot with standard ceilings, 50 BTUH per square foot for higher ceilings. If your needs fall between two sizes, select the larger size. In Houston, your furnace must be sized to hold a 68-degree temperature at 20 degrees outdoor. This is the law.

Homeowner Maintenance: Homeowners can dramatically extend the life of their air conditioning systems with a few simple procedures.

Return Air Selection: Along with a great filtration system, you may need an additional approach to heat removal. Since hot air rises, it makes sense that returns in the ceiling have valid application.

Specifications for a top quality installation: We look at each application and design the system to meet the needs of the home and the homeowner. This is not the norm as the business has been transformed into a commodity with little concerns to specific demands.

Summer Extremes: We learned to tolerate the temperature extremes because we had no choice. Our only respite from the heat is the air conditioning in our homes.

Letter from Lennox on price increases: Raw material demands continue to drive costs for commodities like Copper, Aluminum and Steel higher and higher.

This Contractor Thrives on Controversy: From taking on the Texas Public Utility Commission and Houston Lighting and Power, to sizing coils without automatically reverting to ARI ratings, this contractor makes a specialty of swimming against the current. You may not agree with him, but David Debien has some strong opinions on the future of hvac systems.

Debien's vision for the future: Debien calls himself a visionary. He'll try to build a better damper and a better coil. He wants to design a machine that will manufacture duct on the job economically.

Zoning for 2 Stories: If you have a two-story house with one A/C system, you have a serious cooling and heating problem. In the summer and winter, the heat rises and the upstairs suffers.

The New Refrigerants: Several years back, it was determined that the refrigerants that we are presently using in our air conditioning systems are damaging the upper atmosphere. The EPA made a move to reduce that problem by requiring newer, less ozone depleting refrigerants be manufactured and be phased in over the next 10-15 years.

Two Types of Heat: All homes have 2 types of heat in the air: dry heat and wet heat. We identify dry heat as sensible heat and wet heat as latent heat. Dry, sensible heat, the heat the thermometer and thermostat measures, comes into a home environment in several ways.

Is Your Environment Contaminated? Everyone lives in a contaminated environment. It is impossible not to be affected by the dirt, pollen, and general unknown material that floats in the air that we breathe. There are many ways to minimize the contaminants in your residence. The key component in this scenario is your air conditioning system.

Mold in Your Home: Many homes in the Houston area are affected by mold problems. People spend a lot of time and money trying to eliminate the problem. Some allergy patients take medication to help their condition while living in a sick environment.

Improving the Air Quality In Your Home (EPA): An article from the EPa about improving the air quality in your home.

New Solution Found for Dirty Sock Syndrome: "They call it 'Dirty Sock Syndrome' because thats what it smells like, just like a gym locker," said David Debien, owner of Central City Air in Houston and is known throughout the country as an air conditioning guru."

Slaying the Mold Dragon: Mold seems to be the word on everyone's lips these days. Television programs and consumer magazines are filled with warnings about its hazardous effects and with stories on how homeowners can protect themselves from this deadly scourge.

The New Rules of Central Air: Federal regulations make AC more energy efficient, but units are pricey, bulky.

A Brief Guide to Mold, Moisture and Your Home: An EPA article that provides information and guidance for homeowners and renters on how to clean up residential mold problems and how to prevent mold growth.

Fresh Air: is it really necessary? The majority of air conditioning systems installed in Texas do not have Fresh Air Intakes. Why? Is a fresh air intake really necessary?

Residential Sick Building Syndrome: A relatively new term has entered our lives in the past 10 years, namely, “Sick Building Syndrome”. This term did not exist until the early 1980s. It is interesting to analyze how and why this condition is penetrating the residential market, having already created a mounting crisis in the commercial building industry.

The EPA, the Environment, and the Service Industry: When one looks at this, the title of the article, several inclinations arrive to mind. This must be a bashing of the EPA. Or maybe it ridicules the environmentalist “Whackos” as some would call them. It will do neither.

Healthy Air: A small list of facts about air contaminates with links to other websites about indoor air quality.

Skin Venting - An article by Tom Tynan published in Right Angle about the process and application of Skin Venting.

How equipment is linked to humidity control - There are four main factors to humidity control. These are related to equipment selection and the performance when installed. Of course every home is different, so we will concentrate on performance that affects the home environment no matter how the house is built.

Mold, Mildew and Humidity - A controversial subject too often misunderstood in the air conditioning business is the control of humidity in a home environment in the cooling season. Humidity removal is usually a by-product of air conditioning, not it's main goal.

Let’s do the Sensible Heat Shuffle - This is not a new dance, but something that everybody does every day when you drive. When you first get in your car, it is very hot. You turn on the A/C to maximum until the heat is reduced. As you slow the airflow down, you change the sensible heat ratio from near 90% dry heat removal to 60% dry heat removal.

What is SEER - The Seasonal Energy Efficiency Ratio is a rating put out by the government to allow systems to be compared on an equal basis. This rating gives the consumer an idea of the energy usage. The higher the SEER, the lower the cost to operate.

The New Rules of Central Air Federal regulations make A/C more energy-efficient, but units are pricey, bulky.

Don't Just Sell SEER, Sell Comfort SEER (Seasonal Energy Efficiency Ratio) is a dead issue! What? I repeat, SEER is a dead issue! Comfort is what you must concern yourself with.

High Efficiency Deceit - We are constantly bombarded with so called government regulations that are there to "help us" make an intelligent decision. One of those "buzz" words is SEER. The Seasonal Energy Efficiency Ratio is a government set guideline to advise us to spend our money wisely. This encourages high efficiency air conditioning designs that often fail to address the main reason they are installed.

Majority Rules - In the overall vast experience with other companies’ residential systems installation, it is interesting to look at the majority rules syndrome we deal with. These are the opinions of Central City Air’s late owner, David Debien, and reflect his 25+ years of experience in the field.

Protect Yourself from Air Conditioning Rip-offs - If your air conditioner stops working in the heat of summer, don't run to the nearest A.C. contractor to plead for help. Remind yourself that your fore-fathers survived without air conditioning, and take your time to find an honest contractor.

Broiling on the Outside, But, Really, It's No Sweat - Original article from the New York Times about Houston, its hot summers and how Houstonians cope with air conditioning.

A Season of Distress - David Debien is one of the very few who, truly and gratefully, can tell himself during these sweltering days, "For this, I came to Houston."

A Tale of Two Contractors - I wish I had a dollar for every contractor who has told me "That system performance approach might work where you are, but you don't understand our market here in (fill in the name of any city or state in the country)."

Selecting a Contractor - There are hundreds of air conditioning contractors in the Houston area. Since 95% of all homes have central air conditioning, there is a great demand for service. Selecting a good one takes some homework on your part.

Drywall Linked to System Failure - Complaints about damaged air conditioning equipment, refrigerators and even home wiring spread Monday as homeowners attempt to pinpoint whether sulfur-emitting drywall from China is to blame.

Beware the $29.95 Service Call - The $29.95 service call, is it just tough competition or is it something else?

The following are links to articles on external websites.