Heagstat H721 Non-Programmable Heat Pump Thermostat, 2 Heat/1 Cool, with 4.5 sq. Inch Display

Easy to install. On older heat pumps the e and aux are w2 and we.

This is a very versatile thermostat that will work in a variety of applications. I bought mine to use with an electric heatpump and wanted to be able to adjust the temperature span so that the heatpump would start and run for a longer cycle period. This is much easier and more efficient for the compressor on a heatpump. Many modern thermostates only allow only a CPH (cycles per hour) adjustment that will not limit the on-off times of your heating unit, since the thermostat will prioritize the temperature setting over CPH. This thermostat allows adjustment of the on and off temperature up to 2 degrees on the high and low temp (span) on either the AC or Heating side. It is accurate and so far has worked flawlessly, a bargain compared to the Honeywell thermostat it replaced.

Great product, it worked as stated.

I would have loved it had I picked the right size for my home.It was nice and big

It works. Just need professional help. Cause my compressor did not perform perfect as it does with the same kind of the AC units. So, in short look for compatibility.

The Heagstat H721 Non-Programmable Heat Pump Thermostat was a fairly easy swap out from a VIIVE TP-N-721. The plug on back plate was different. I killed the evaporator control voltage breaker. Then took a picture of the before thermostat wiring for color codes and connection point reference which was similar. Get help from an electrician if you don't know what you are doing electrically. This thermostat controls the compressor control relay, the reversing valve and the heat strips. I laid out the two thermostats documentation side by side for reference. Amazon delivered the thermostat the next day, so we did not have to go without too long.

My heat pump is a two-stage aux heater, O is 0 volts for heat, and 24 volts for cool. Hooking up the thermostat easy enough, but the first thing I noticed was that it read the ambient temperature poorly. My 71-degree room was showing as 73 degrees. Okay, no problem, to test the heat I put the set point at 74 degrees - the Heat pump came on, but was pushing cold air. I gave it a while. I thought, perhaps this thing is backwards, so I tried the A/C after a while - it also pumped the same cold air. So I gave up, put the old thermostat back in and reheated my now cold house. Garbage. You get what you pay for - In my case, this would work for an A/C unit, but not for heat.

Works perfect and wonderful price

Easy to install, seems to be working just fine. Use it in my garage (radiant heated)