Hello, new member here on hvac-talk and seeking some guidance about the HVAC system that is setup in my home. This is for a 3400 sq foot home built in the 80s with 2 large Carrier heat pumps, 2 air handlers with resistance heat backup, and 3 zones total.
There are 3 thermostats in the house right now. Two of them are the original 80s, non digital thermostats. One of them was upgraded at some point with a lower end digital unit that we find very confusing to use. There is also a main switch for the entire house which controls whether the systems are in heating or cooling mode. I believe that this switch can also be used to force the systems into backup heating mode only (not too sure). I have never seen anything like this before.
We would like to replace the thermostats in the house and I am seeking some guidance on what thermostat to use. We want a unit that will give us complete control over the HVAC system. My requirements are as follows:
- manual shutoff for resistance heat
- programable setback for the resistance heat, ie. so that I can limit how often the backup heat turns on
- programmable schedules
- exterior temp sensor with heating algorithm to limit the use of the resistance heat
- multiple wireless interior temperature sensors
The manual shutoff for the resistance heat is important for us. We lost power for 9 days as a result of hurricane Sandy and dealing with the HVAC system was a big problem while running on our generator since I couldn't prevent the resistance heat from turning on.
Any input about the main control switch would be great as well. We are not sure if this is going to be a problem for the new thermostats. I don't really understand why it is necessary to have that switch but I am not sure what would be involved in removing it or if it is even worth bothering.
thank you for your help!