Question about Whirlwind FH-778 Air Conditioner

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It is 110 degrees out, we have set the central air for 70 but we can not seem to get the temp under 74 degrees, the unit is always running is it just too hot out for the unit to keep up, or is something wrong with the unit

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You probably hit the nail on the head. You are currently getting 36 degrees difference in temp. That's pretty darn good. Most units would struggle with that. Running all the time is usually an indication that the unit could be somewhat undersized too. 74 degrees is not that bad under those conditions.

Posted on Jul 30, 2009

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I agree you can normally get a 20 drop in temp. from outside ambient. The system sounds like it is doing it's job.

Posted on Jul 30, 2009

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1 Answer

My thermostat show 74 degrees as a current room temp...but we have it set at 70 and it's probably 65 in the house. ..the only way it will turn on is if I put it 74 or 75????


The old white-rogers thermostats with a mercury switch are adjustable. snap the face off. In the center you will find a plastic slot screw. set the indicator to the actual room temp.
Other type ? Replace the thermostat

Mar 01, 2015 | Heating & Cooling

1 Answer

I don't know a good setting on a robertshaw 9420 thermostat, for really cold,and fast air condition.


Well Brian, an air conditioner creates the same temperature drop across the evaporator at any thermostat setpoint, so there is no setting that will get it really cold really fast. If your return air is 88 degrees (in a hot house where the system has been off) the supply air temp is going to be near 68 degrees..... as the a/c runs, the air changes within the structure cause a reduction in the average return air temperature and slowly drops the return to 87, then 86 then 85 etc, etc and the corresponding supply air temp continues to drop from 68 to 67 to 66 to 65 etc etc. Eventually the supply air temp after the appropriate 'air changes' within the structure will drop to 55 degrees and possibly even lower to satisfy the average room temp at 75, 74, 73 etc. to a point.

There are SOME newer a/cs that have two speed compressors that may effect the supply air temperature drop under differing load conditions, but thats a different ball of wax.

So, if you want it cold quickly you are out of luck, just leave the t-stat set at 70 degrees and pay the electric bill when it comes in.....

Dec 25, 2014 | Heating & Cooling

1 Answer

Hi,My remote do not get the good temp in my house. Ex: I set to 80F in heat mode but the thermopump operate slowly and dosn't get hire than 70-72F. The remote see the unit and all. Is the sensor in th


You have a heat pump.
Once the outdoor temperature falls below 36 degrees, heat pumps will sharply lose their ability to heat.
If you are getting a 72 degree indoor temperature when the outdoor temperature is 28-30 degrees, the heat pump is performing up to spec.
On heat pumps, the air coming out of the nearest air vent to the unit should be heated approximately 40 degrees warmer than the air entering the unit.
If you have a 70 degree indoor air temperature, the heat pump should be supplying 110 degree air at the closest air vent to the indoor unit.
Gas heat is a much better heating source where outside temperatures are commonly below 36 degrees.
Even electric furnaces perform better than heat pumps under these conditions.

Nov 30, 2014 | Heating & Cooling

1 Answer

Outside unit runs for about 5 seconds then shuts off for a few seconds. It repeats this cycle.


Put in a 5 minute time delay. It is a two wire device in line with the contactor. Sounds like it is set to 75 turns of at 74 and repeats. The tstat should have a differential of 2 degrees as well.

Dec 22, 2013 | Heating & Cooling

1 Answer

User manual for jnc JAC-24Y2???- want to know what the optimal setting for heating temp is for economy in the unit. We seem to have to have ours set quite high to get the unit to run consistently. If we...


Normal settings 70 heating 74 to 76 cooling, I try to leave my cooling a 76 and keep it there. 76 degrees feels good if its 95 or hotter out side and the lower you set it the more it will cost.

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1 Answer

My Honeywell AC unit doesn't seem to be working properly. It will not retain a temperature. I set the thermostat to hold a temperature of 70 degrees. Room temp still reads 74 degrees. Something is working,...


The frost on the pipe indicates you have a dirty filter, dirty evaporator coil, Blower not running at the proper speed (to slow) or you are low on refrigerant.

Jun 29, 2010 | Heating & Cooling

1 Answer

We just turned on our central air conditioner last night. today the temp of the house was 80 degrees. someone in the household placed the tempature on 70 degrees cool on auto. we have not felt any air...


Did you hear the indoor unit running (the fan blowing)? If so, there's a good chance that either the filter is plugged or more likely, the evaporator coil is iced up and preventing any air from flowing into the dwelling.

This points to a refrigeration issue with the unit - possibly a leak or low refrigerant charge.

You should turn the A/C off and leave it off for a day. Then just turn the indoor unit fan on by selecting the fan "on" setting on your thermostat. If you feel air coming out of the vents, then the evaporator coil was probably frozen.

If you are not an HVAC tech, it's time to call for professional help.

Apr 07, 2010 | Heating & Cooling

1 Answer

A/c doesn't remove moisture in the room? even when exchanger is set on open or closed--no moisture in collection tray either model #agj3211daxt2    G.E.


An A/C unit is a dehumidifyer BUT Unit are rated in Pints of water, a Unit in Florida might need a de humiditiyer connected to it, the air is heavy with humidity. Another reason is that the Unit is under sized or not allowed to run long enough (?) Infor. on what State you live in would help and the size of the apt. or house the unit is covering. The best T / H would be 70* and 55 H and that would be on the cool side for most people , avg temps in a house would be 74* 65%, body temps are 98.6 most A/C unit are rated at 90* amp temp ( outside ) if the condenser is dirty this will cut the performance on a hot day over 85* Keep unit clean -replace filter (s) . If your getting a 15 degree reading between outside and inside your doing good the best would be 20 degrees ( depending on heat load) windows, and sun. Actic fans remove 30% of the heat -it will drop the temp from 120 to about 85, this can save you a lot of money in A/C bills and help cool the house in warm day when you don't need the A/C.

Apr 27, 2009 | GE AGQ10AJ Wall/Window Air Conditioner

1 Answer

I set the thermostat to 70 degrees but it doesnt cool down to 70, it seems that the temp in the house only rises, instead of cools down.


Setting Unit at 70* ? and not cooler ( dropping temp in the house ) Question ? does temp dop at all, if so the Unit maybe unsized, if the temps are going up then the unit is not working at all - maybe just the fan is running. If this is a split unit ( outside unit / furance). A number of things could cause the same problem - call a sevice company. it could be anything -from a Breaker to an electrical part, split Units have to different breakers ( fuse) . Check that first

EM

Apr 26, 2009 | Heating & Cooling

1 Answer

I set temp to 74 and stop at 70 and decresing.


The only thing I can think of other than being just old and worn out is that by design it may not be set to run but so much at a time. Has this always done this since you have had it? It may be needing calibration. One thing you can try is to set it at 2 degrees higher than you want it and then it would shut off at the temp you actually want.

Mar 04, 2009 | Hunter Fan Company 7-day programmable...

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