Central Air Conditioner Prices | HVAC Buyers Advice - So you are looking to buy a new central air conditioning system? You want to know the price of the new air conditioner after it is all said and done. The complete price of the new air conditioner after it’s installed and the contractor walks out the door? The price of a new air conditioner is a popular subject. We get several emails every month asking how much it would cost to install a new air conditioner.
First, it is a loaded question. No air conditioner installation job is the same. Some air conditioner installation jobs being more difficult than other air conditioner installation jobs. The fact is, I cannot give anyone the price of their new air conditioner without first seeing the job. The fact is no one can give you a fair and reasonable price for a new air conditioner cost without first seeing the job. They must see it first and then do a little homework.
Lennox Versus York Air Conditioners - Here is a Lennox and York comparison for their premium model air conditioner as requested by a reader of the site. Just off the top of my head, both systems are good systems. I would say Lennox had a slight advantage but the first-hand experience in the field gives most HVAC technicians the opinion that Lennox is over-engineered. (more…)
HVAC and Electrical Fundamentals - Electricity is usually produced by a generator at a power station and delivered to sub-stations for distribution to homes and businesses. Electricity can also be produced using chemicals like the chemical processes produced in batteries. There is also static electricity which is generally produced from friction and is oftentimes uncontrollable like lightning. (more…)
Converting an Air Conditioner to a Heat Pump Can I convert my air conditioner to a heat pump? Yes you can do this if you:
I get this question a lot in my emails and wanted to address it. The time and materials it would take to change an air conditioner into a heat pump are not worth it. You would be better off having a new heat pump installed replacing the old air conditioning unit. For me, or another HVAC technician, this would be a pet project for teaching students how to braze for refrigeration and wire heat pump controls for the proper sequence of operation.
It would be a good lesson in metering devices for air conditioners and heat pumps. It would also be a good lesson in finding all the appropriate parts for the size and model number of the air conditioner equipment.
The TXV or Thermostatic Expansion Valve is preferred over other refrigeration metering devices because it only allows a specified amount of refrigerant to flow based on demand. Any type of refrigeration metering device creates a pressure drop in the refrigerant and with a pressure drop of the refrigerant a temperature drop also occurs.
This temperature is necessary to drop the refrigerant down to temperature lower than ambient temperatures inside the structure being cooled. This allows the refrigerant to absorb the heat contained in the air passing over the evaporator coil. (more…)
Window Unit Air Conditioners Heat Pumps – First of all, window unit air conditioners are a popular way of providing cooling in small to medium-sized rooms. Window unit air conditioners are easy to install. They usually only require someone with the strength to lift the unit into a window and secure it. Then you plug it in and turn it on. It’s that simple and is the closest thing to plug-and-play air conditioning you can find. (more…)
Heat Pump Types - There are different types of heat pumps available on the market today. A heat pump is an air conditioning unit that cools when the temperature is hot and heats when it is cold. There are many different types of these heat pump systems available. There is the geothermal heat pump. It can either utilize a series of closed-loop water pipes buried in the ground or other methods of heat exchange. This process removes or absorbs heat for heating and cooling.
Air source heat pumps can be configured differently. One type of air source heating will utilize electric heating for backup heating while another may use a gas furnace for backup heating. These types of systems can also be split systems or package units and nearly all share a similar heat pump sequence of operation. A description of the various types of systems and how they work is below in this article on heat pump types. These systems utilize similar heat pump components but differ in how the heat pump works.
HVAC Tip - Did you know the human body produces approximately 250 BTU/h when sleeping? Here is a basic list of the approximate BTU/h produced by the human body for various activities:
Watching Television - 400 BTU/h (any sedentary activity)
Cleaning the house - 700 BTU/h (moderate activity)
Mowing the Grass w/push mower - 1800 BTU/h (heavy activity)
Running a marathon - 2400 BTU/h (extreme activity)
The number of people occupying a dwelling or space is a consideration in the load calculation for sizing air conditioning systems simply because humans do give off heat. BTW, the Matrix over blew the numbers. In the movie Morpheus states humans give off over 25,000 BTU's. Only the author of this website is that hot..............))))))
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Lennox Versus York Air Conditioners - Here is a Lennox and York comparison for their premium model air conditioner as requested by a reader of the site. Just off the top of my head, both systems are good systems. I would say Lennox had a slight advantage but the first-hand experience in the field gives most HVAC technicians the opinion that Lennox is over-engineered. 
