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Our wall mounted air con is set at 16 degrees but it is not cooling the house at this temp. Could it be the thermostat

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Most wall mounted ac units are designed to only cool a room, not a house
close all the doors to the room along with all windows
generally a 3kw unit (32,000btu )will cool a room 12ft X 12 ft X 9 ft quickly but anything bigger, the time that is taken to bring the temp down gets longer and longer depending on the setting and 16 C is far too low

Posted on Dec 07, 2016

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Its probably not the thermostat. The air conditioner may be stuck on heating mode. If its a reverse cycle, the reversing valve may be jammed so even when the thermostat is calling for cold air, it stays on heat. If the machine is on heating mode, it should be blowing cold air out of the outdoor unit of the air con. If its on cooling mode, the outdoor should be blowing hot air.

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Make sure the Thermostat is set correctly! The problem with mine was the temp in the house was colder than my A/C lowest thermostat setting.I had my AC temp setting on 66 degrees.The temp in the house was a little lower so the AC didnt kick on just the fan blowing cool air and no compressor working. The next day it was warmer out and the house temp was 79. So when I powered up the AC set at 66 i heard the compressor kick in and the AC worked fine.

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Tried another thermostat? Also check that where thermostat is mounted isn't a warm zone, that is detecting higher temperatures. Put another thermostat on wall beside it to check. Another thing is to take thermostat of the wall and let it hang and try it. I've had some where warm air was blowing/sucking past hole for wiring in wall, and throwing thermostat off.

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Lasko 5141 - I set the temp to hold @ 68 degrees at night but it seems to ignore the setting and gets into the high 70's. This is with the rotation switch on if that makes a difference. Any Help ? Thanks


Remember it is always colder at the floor level, the heater is pretty close to temp when it is above 40 degrees outside, but as the temperature gets colder outside so does the temperature at the floor level in your house because heat rises.

I use my house furnace thermostat mounted half way up the wall as a guide, When the temp outside is in the teens, I have seen as much difference between the floor temp on the heater and the wall to be 4-6 degrees different. So this means as the tempurature outside drops you need to regulate the thermostat on the heater downward to compensate for the colder floor temperatures.

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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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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.

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Good after noon i have a Starway Split Wall Mount Reverse Cycle Air Con. the problem i have is when i need to warm my house the air coming from the system is cold. even with the temp setting on the sun...


Hello,

Examine the condenser. The condenser pushes the air and expels the warm air from the air condition to the house. Also check the fan heater on your system to see if it is functioning, because if it is not, it will circulate the heat from the unit to the house, in this case,it will need to be fixed. also check if the thermostat on the unit is regulating because if it is not regulating, you will not get the house to warm due to bad thermostat, check to ensure it is regulating, if not, replace it, it might be defected because that is the key to regulate the unit. so pay attention to it to see if it regulating the unit, if not, replace as advice.

Take care.

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Can not get temp below 77


Is the thermostat set up for automatic change over from heat to cool? If so, the heat is probably set for 75, you will need to lower the heat setting in order to Lower the cooling. the stat won't let these settings with in 2 degrees of each other so the heating and cooling don't fight each other.

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Problem with mitsubishi air roof units


to tricked the thermostat only a way i know,to put on it an ice cube for a while.propably wrong choice to installed roof unit you must installed to the floor better for the ac and to you

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Rinnai 1004 - Temp on thermostat reads 10 deg cooler than actual, keeps running


Behind the unit near the floor level, is a yellow wire with a black bulb at the end. This is the actual sensor for returning air. If there is cool air infiltrating the area where it is located, it will keep the unit running until the return air reaches temperature. You could also have a bad sensor but highly unlikely. Make sure there is no air infiltration influencing the sensor. Also, you can unclip the sensor and pull out a few more inches of wire to locate it higher up away from the floor. Tie it up with a wire tie.

Rinnai it testing a remote thermostat but as of yet, there is no plans to offer one.

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