Tip & How-To about Heating & Cooling

Simple way to make AC run more efficient and save on electric bill

With the heat of the summer many air conditioner are working hard and running up electric bills. Many old air conditioner would have dirty evaporator which blocks some or most of the air going through it. This make the system run harder since it cannot cool the house as it should. This causes the AC system to run continously without ever shutting off.
There is a new product on the market avaible at most AC supply store to clean the evaporator coils that do not need rinsing. It desolves mildew and other things that causes blockage. Make sure also that you change your filter regularly.

If your airconditioner has been on for a long time and does not shut off, you are wasting power. Turn the thermostat up just enough so it will turn off. Setting the AC lower will not make a diffrence in the temp when the wheather is hot since the system is not able to reach the desired setting because that is as cold as it is capable of. One degree of in setting can mean a lot over a whole month period. The rule of thumb is keep it above 75.

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Since the failure of an air conditioner to turn on, loss of air conditioner cooling capacity, reduced air conditioning output temperatures, loss of cool air supply, or even loss of air flow entirely can be due to a variety of problems with one or more components of an air conditioner or air conditioning system, after reviewing the lost air conditioner cooling diagnosis procedures described in this article, be sure to also review the diagnostic procedures at each of the individual air conditioning diagnosis and repair major topics listed just below. To return to our air conditioning and refrigeration home page go to AIR CONDITIONING & HEAT PUMP SYSTEMS.

Electrical problems on HVAC systems: Keep in mind that despite the depth of technical detail you will find here about all components of air conditioners and heat pumps, most service calls for non-working air conditioners or heat pumps turn up an electrical problem. So if your A/C system is just not working at all be sure to check all of our electrical and control setting suggestions first.

Mechanical problems on HVAC systems: tend to fall into these groups: refrigerant leaks, dirty condenser coil or unit, dirty evaporator or cooling coil, or burned out (or hard-starting) compressor motors. We have also seen a number of problems with fans and fan motors in both the compressor/condenser unit and in the air handler/blower fan unit. Some of those fan problems are mechanical - like a loose fan belt or blade. MORE DETAILS

Nov 13, 2012 | Heating & Cooling

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Where do the 3 wires from the blower motor connect to on the control board for high speed use in the summer time? Black, Blue, and the Red one? The white is a no brainer. I can go to M1, cool, and heat. Ruud, lateral in the attic. UGPJ-10EBRJR. I have blue on M1, Black on cool, Red on heat. Does that speed take air across the evaporator the quickest? New motor ha same specs as old; 3/4 hp, 9.4 amps, same frame...matches up perfectly to the old. I'm freezing up.


Hello, the black wire is your high sped motor tap and it should be on cool as you have it. Blue is med-hi and red is your low speed motor tap. You have it wired correctly. Now the freezing can be caused by 2 things, low airflow or a low refrigerant charge. Low airflow can be caused by a dirty air filter, dirty evaporator coil, dirty blower wheel or the blower itself is running slow due to a weak capacitor. Anytime the motor is changed out the capacitor should aswell. If the airflow appears to be ok then the unit is low on refrigerant.

Jul 11, 2012 | Heating & Cooling

1 Answer

Blowing warm air. Noticed that electric bill the month it stopped working was triple. I assume it was working hard to produce cool air


Yes, the compressor was working extra hard to try and keep the place cool. Freon must be escaping from somewhere. Hopefully, it is just from the schraeder valve stem. If evaporator is iced up, run it on fan to thaw out the ice before applying freon to unit .

Jun 27, 2009 | Heating & Cooling

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