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What should the supply air temp be on a home a/c system? we cannot get the temp in the house below 80 degrees when the outside temp is above 90. the home is in Alabama. the supply air temp is 66 degrees.

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  • d_koepele Jun 18, 2009

    Thanks, this supports my theory

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Should be more like 58F depending on the the house temp 20 deg. difference from supply air and return. unit is probably dirty and or low on freon. Tom

Posted on Jun 18, 2009

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What is the low pressure for a 410a 3 1/2 York when is 90temp at fh outside.


The outside ambient temp has little effect on the suction pressure. The indoor temp is what will slightly effect the suction pressure. In the trade we say we want a 40 degree evap coil, this means approximately 125psi. This is when the indoor temp is around 74 to 78 degrees. The hotter the house, the higher the pressure. I like to see a 50 degree evaporator when the indoor temp is above 80. Charging by subcooling is the way to go!!

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Heater will not activate until outside temp. is above 40 degrees


If you have a heat pump the compressor is locked out below that temp. If you have a dual fuel - hp/gas, the gas burners should come on as would the electric heaters if you have electric heat as backup.

Jan 19, 2016 | Heating & Cooling

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Our upstairs Central AC unit will not cool below 80 degrees. Everything is blowing fine. It is 89 degrees outside today. The air coming in thru the ducts is 80 degrees. The downstairs unit blows 70...


you will need a thermometer, you can use a meat therm.take a temp reading of the air going into the return and then coming out of the supply at the unit, it should be at least 15 to 20 degrees cooler in the supply, if not it may be low on refrigerant also check filter and return duct make sure your not pulling air from attic

Jun 30, 2013 | Heating & Cooling

1 Answer

My Goodman unit won't cool below 78 degrees inside during this heatwave. The thermostat says


your home may not be insulated well enough or you could have leaking duct or your system may not be charged correctly ac systems are not sized to cool below 76 degrees above 90 degrees outdoors because this will increase your utility bills during the cooler temperatures. thank your governement and all the regulations we have to follow for this. they would rather you save money than be comfortable. and we are actually in violation of state law and federal law if we install a unit that will cool below 76 degrees on 90 degree outdoor temp

Jul 02, 2012 | Goodman CKL36AR36 Air Conditioner

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I want to know what temp to expect out of my register if for example the outside air is 90 and the inside air is 72 and if their are any other specific details(not interested in hooking up my gauges...


Hi,
For comfort cooling w/ r22, you can expect a delta- t of 20 degrees F across the evaporator, or a seventeen to twenty degree drop from return to closest supply grill, so if your return air temp. is 72 degrees, you should see from 52 to 55 degree air temp. at grill.
Other factors come into play as well, how well insulated the duct work is, r-6 is industry standard now, and how well insulated the attic space is as well as temp of attic space, ridge vent works well, and so do solar barriers to keep heat out of attic space.
This should help.

Jul 27, 2011 | Heating & Cooling

1 Answer

My home air conditioning unit comes on with the thermostat and blows cold air when the outside temp is 80 or below/ When the outside temp is hot, above 90 degrees, the unit will not turn on. Any...


Make sure the coils on the outside unit are clean as can be, if any dirt or anything else is blocking the air flow on the coils, take a water hose with a medium stream and work your way from top to bottom, being carefully not to damage the aluminum fins. You can also be over charged on refrigerant which will have the same effect as dirty coils and cause the pressures to get so high, the compressor over works, over heats, and shuts off on thermal overload. It is still possible that it will blow cool air when the temp outside isn't that high, simply because the pressures are further down on the system. I would start there at least, it's easier when your there in person sometimes. Hope this helps anyways, if not, write another question but be sure to explain which components are working, inside and outside, and if the filters have been changed, and if the coils have been cleaned. It just helps to narrow it down. Again, hope this helps and good luck!

Jun 21, 2011 | Heating & Cooling

1 Answer

I am working on a M # GPG13420901AB. This is a 3.5 ton package unit that replaced a 3 ton package unit on 1700sq/ft single level home. Old unit was working fine but was replaced when the home was...


It sounds like you are low on charge. I think you have a thermostatic expansion valve and you need to check the subcooling, you should have 12 to 15 degrees at 95. At 95 degrees your head should be about 280# for a 12 or 13 SEER unit or higher depending on the effeciency. At 78 to 80 degrees indoor depending on the humidity, that is normal. The valve will open to try to fully feed your indoor coil and it sounds like your head pressure is to low to force enough refrigerant thru the coil.

Aug 16, 2010 | Goodman Heating & Cooling

1 Answer

Unit not cooling house below 80 HELP ME PLEASE


It's 98 outside ... that says a lot. The gurgling is an indication that you are getting a lot of water out of the air (dehumidifying). If the unit is sized just right, or just a little too small, it may be working perfectly well.

You don't say where you are, geographically, but much to the US has an air conditioning design temperature of 95 degrees F. That means at 95 degrees, the unit will run continuously. With a 50% outside air relative humidity, it should keep the occupied space at about 75 degrees F. The more humid the air, the more the unit works on dehumidifying and less on cooling.

Give it some time, wait unti the weather breaks and see if it doesn't run just like it used to. If you chose to call a technician, have him/her take temperature readings of the condenser entering and leaving air, the suction line temperature, the liquid line temperature, the inside supply and return air temperature (dry bulb and wet bulb) as well as high and low side refrigerant pressures. Before they make ANY changes to the system (refrigerant charge) have them explain what they found wrong and make sure you understand what they are talking about. Adjusting the charge under these conditions, will mess up your operation under normal conditions.

Jul 20, 2010 | Whirlwind FH-778 Air Conditioner

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Air temp indicator only reads temps below 50 degrees


Ambient air temp sensor could be the cause. Normally located in front grille area.

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Rooftop RV Air Conditioner: temp outside 90 or above. compressor kicks off ....


It sounds like maybe an overload for the compressor is tripping and resetting once the compressor cools. Possibly due to a low charge.

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