I have 2 AC/Heating units in my office building. Usually only 1 room (per unit) at a time is used, even though the HVAC system covers several. Unit 1 covers 2 large rooms ~600sqft each and Unit 2 covers 4 rooms 150sqft/ea and 2 bathrooms, single stall.
The problem I'm having is I can't get even heating/cooling across all the rooms. One, or more, rooms are always too hot or too cold. I have had a couple of local HVAC companies come by to give suggestions on how to fix it and they want to install a zoning system ($$$$$$). Being a small business, I don't have the money to have that done.
I'm not knowledgeable about HVAC systems, but some ideas I have are:
A thermostat in each room and a selector switch to choose which room is being used.
Is it possible to have a sensor in each room that averages the temp? (would this still cause hot/cold spots?)
Hooking a thermostat to a long cord and toting it around. (yea, I know, I'm reaching)
When I decided I didn't want the zoning, they didn't offer any other solutions. I'm looking for other suggestions, so when I call someone else I have some ideas on what can be done without the cost of a zoning system.