A few nights ago I noticed that when I turned down my upstairs thermostat below the current temp, it did not click and I never felt air blowing out of the registers.
The next day I had someone out and he checked the freon which was good, and then we went into the attic to look at the unit there.
It had been off for about 6 hours and when I turned it on, water began coming out of the unit (Comfortmaker N8MPN/L) into the pan.
We ran the heat for 30 minutes, then switched to air and cold air began blowing forcefully out of the registers.
The HVAC service tech said that it had frozen up and that since the freon levels were good and the filters were good that it was likely one of two problems...
1. The thermostat was failing and leaving the compressor on even when the fan was not running.
2. The electronic board in the actual unit was failing.
It happened again last night. I turned it off and left it off, thinking that I would start by getting a new thermostat. I was hoping for one with a remote control so I could adjust temps from the bed without getting up at night - but Lowes does not have such a thing.
I can pay $80+ for touch screen and various programability - but I didn't see any remote controls.
My current thermostat is programable, but it doesn't keep time for squat so I've never bothered. That isn't an issue for me really.
My questions are as follows...
1. Do you think the advice that I was given is accurate and should I start with replacing the thermostat before calling the HVAC service person back out? That would be a relatively inexpensive and easy cure if it is a likely cause.
2. Is there anything special you'd recommend in a thermostat?
3. Anything that I'm not asking that I should?