Am looking for advice on adding a second thermostat to my system. I currently have a two story home, with one zone for the whole house. My question is can I add a thermostat upstairs (currently active tstat is downstairs) while keeping the one downstairs active.
My thinking is if tstaA is off, and tsatB is on then the system should work as normal. Obviously if both are on then the system wouldn't work normally, and if they were both off then the system wouldnt be on anyways.
Does this make sense and will it work for the mean time until I can save to have the second zone installed?
If the upstairs is warmer or colder than downstairs, you are better to find out why the system is not working as it should, or why the house is not insulated properly. As for using a remote thermostat, they are better for when you zone a system, due to it is either going to cause the lower floor to be either too warm or too cold. Also, if you do not have cold air returns in the rooms upstairs, not including baths, that can cause hot and cold zones.
What is the temp difference between floors, what is the air temp at the furnace/air handler, at the register on the first floor, register at the second floor, cold air return on the first floor, and cold air return on the second floor.