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AC Question: Temp increases when I set the thermostat lower
Posted on 5/9/24 at 7:06 pm
Posted on 5/9/24 at 7:06 pm
Noticed this issue yesterday evening when I got home and again today. Got home and the AC was set to 72 and cycling on and off as usual. Decided I wanted it a little cooler so I dropped it to 70. About 30 minutes later I feel the house getting warmer and more humid. Checked the thermostat and it was reading 74.
I pushed the thermostat back up to 74 and the system eventually cycled off. I let it run another cycle at 74 and then after it kicked off, waited about 5 minutes and set it to 73 and then let it run for another couple of cycles. Did the same thing again and now I have it back down to 72.
Filter was changed yesterday and I've checked the pan in the attic and there is zero condensation in it. Went outside and the low pressure line is sweating but does not feel very cold at all. I'm assuming it's low on refrigerant but any other possible suggestions are welcome.
The outside unit has one of those blue filters on one of the lines which tells me a few years before I bought the house, there was a leak and the filter was put on.
I pushed the thermostat back up to 74 and the system eventually cycled off. I let it run another cycle at 74 and then after it kicked off, waited about 5 minutes and set it to 73 and then let it run for another couple of cycles. Did the same thing again and now I have it back down to 72.
Filter was changed yesterday and I've checked the pan in the attic and there is zero condensation in it. Went outside and the low pressure line is sweating but does not feel very cold at all. I'm assuming it's low on refrigerant but any other possible suggestions are welcome.
The outside unit has one of those blue filters on one of the lines which tells me a few years before I bought the house, there was a leak and the filter was put on.
4
Posted on 5/9/24 at 7:46 pm to BayouBengal51
quote:
Noticed this issue yesterday evening when I got home and again today. Got home and the AC was set to 72 and cycling on and off as usual. Decided I wanted it a little cooler so I dropped it to 70. About 30 minutes later I feel the house getting warmer and more humid. Checked the thermostat and it was reading 74.
you need to replace the batteries in it once a year
when the batteries get weak, the thermostat can do some very strange things
if you dont have a battery operated thermostat, or it could just be that you short cycled the outdoor unit causing the compressor overload protection to trip and shut the compressor off, it doesnt reset until the compressor cools of
This post was edited on 5/9/24 at 7:53 pm
Posted on 5/9/24 at 9:46 pm to BayouBengal51
Sounds like your A coil in the attic is freezing up. You need to check your suction side refrigerant line. That’s the big line going into your outside unit. Either low Freon or low air flow across the coil will cause it to freeze up.
Posted on 5/9/24 at 10:05 pm to BayouBengal51
For what it’s worth, my thermostat is doing the same thing right now and it’s electric, not battery powered. Granted, my coils are frozen, the blower is breaking, and there’s a major coolant leak in it right now and I’m replacing it next week.
I’m sure it’s just a coincidence that we’re having the same problem right now though
.
I’m sure it’s just a coincidence that we’re having the same problem right now though
. 
Posted on 5/10/24 at 11:02 am to BayouBengal51
That happened to me when changing a friend's thermostat to a Nest. In the first few iterations, the Nest couldn't actuate the reversing valve in certain heat pumps. (Undersized mosfet switch.) So this unit heated no matter the heat/cool setting.
Sounds like a different issue here, but wanted to add that possibility for future reference.
Sounds like a different issue here, but wanted to add that possibility for future reference.
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