Question about Heating & Cooling

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My house will not cool. I have the thermostat set on 70, and it barely makes it to 75. Before I call my landlord and have him check it out, is it just because it is so hot outside (I live in AL and then temps have been in the 100s the last several days), or is there something wrong? There is an exhaust fan for the attic, and I keep the blinds closed all the time. Thanks!

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Hi, the design temp for air conditioners is 90F. When the outdoor temp is over this you may notice it not keeping up. However, there are some things you can check. First, check the air filter. Next check the indoor and outdoor coils to see if they are clean. These coils need to be clean to work efficiently, especially when it's very hot. You can get some cleaner for the indoor coil that does not have to be rinsed off. The outdoor coil will have to be rinsed though. Of course there's always the possibility that the refrigerant charge is low. Let me know what you find.

Posted on Aug 06, 2010

  • jen-nay-gump Aug 09, 2010

    Thanks for your tips. I eneded up calling my landlord, and he sent an AC guy out. The guy said there is nothing wrong with my unit, that because it's 100 degrees outside, my unit cannot keep up. This makes sense during the day, but when it's 80 degrees outside at night, why will it not cool any lower than 78 degrees in my house? I have never had this problem before, and I feel like they are just blowing smoke up my rear so the landlord doesn't have to pay money to get it fixed. At times it doesn't blow cool air, and at times it won't pull air into the register. I have also noticed ice on the coils outside. And it never shuts off, ever, even if I put it on 80.

  • Brian Niten Aug 10, 2010

    If there is ice on the coil outside, that would indicate a low charge or an air flow problem. You said at times it doesn't pull air into the registers. The next time that happens, check the indoor fan and see if it is running. Also like I said before check the air filter.

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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

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Dear Sir:
1) Could be a reason just moving the thermostat.

2) You need to check the unit for condenser + evaporator very well from a Tech. Since the freon is not good signal for a good operation , the reason is may be some Leakes in the pipes.

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If the thermostat says 89 which is house tempture, what should I put the air condition on to off set that temperature to make it cool in my house, right now air condition is set for cool @ 70, and house...


Hi,
You have done everything right there...something is wrong with your A/C...

Here is a tip about troubleshooting your airconditioner...
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AirConditioner Trouble - Review the Possibilities

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I have never used central ac before - how do I set it? If it is on 75 will that cool the house? If I want it cooler, do I put it lower? like 65?


As to your question 'will 75 cool the house?' The answer is 'yes' - if the outside temperature is low enough. Typically speaking you can expect your central AC to cool a properly insulated house to a down to a temperature of about 20-25 degrees lower than the outside temperature. For example - if the outside temp is 95 degrees. You could expect to get your house down to 70-75 degrees. If the outside temp is 110 degrees then you could only expect to get the house to 85 or 90 degrees.

So .. as you can see - your 'inside' temp will be directly affected by the 'outside' temperature.

As to the operation of central air; it is very simple.

I would suggest that you not pay 'too much attention' to what you have the thermostat set on. A comfortable temperature - is a personal thing - so - I would set it somewhere - say 72 and see how I (and others in the house) was handling that setting.

If you want it 'cooler' just 'notch' it down a degree or two - if you need it a little warmer - turn it up a degree or two. Do this "fine adjusting" till you have the temperature setting you are comfortable with.

Usually the more you can leave your thermostat alone the better off you will be from a comfort position and an electrical useage standpoint. Obviously, the higher you have your thermostat set the 'less' it will cost you on your electric bill.

How high you set the temperature is a balance you have to come to based on how comfortable you want to be - matched with how much you want to hold down the electric bill.

hope this helps

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This sounds like an airflow problem. You said you change the filters every 3 weeks or so. Check the filters and the indoor coil to make sure they are clean. Also look at the indoor fan and make sure it is running and running at speed. A fan that isn't running at the rated speed will cause the coil to freeze. A weak capacitor can make the fan run slow. Also make sure the fan blade/wheel is clean. A low refrigerant charge will also cause the unit to freeze. It doesn't matter what you have the thermostat set on because the temperature of the refrigerant is determined by the pressure of the refrigerant and the airflow across the coils. If it freezes up again you can put it in heat mode to melt the ice.

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Check the filter(s). Dirty filters is the primary cause for such failures. Secondly check the thermostat and make sure that it is not turned way too low. Anything above 70 is safe from causing freezing on the unit. If the unit is already frozen then turn the unit off until it is totally thawed and then retry.

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1 Answer

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