This question already has an answer here:
I have a problem similar to others that have posted: balancing heating/cooling throughout the house. I have already played with adjusting the vent's air flow as well as the manual dampers in the basement runs.... nothing seems to work sufficiently.
So I am trying to figure out how to add both an extra thermostat for the bedrooms and electric dampers to control the air flow to just the bed rooms when needed. My thought is to install electric dampers on the main level HVAC branches off the main run.
The trick is I need something to help with the very simple logic:
- When both thermostats on are, all vents are open.
- When The Main is on but bedroom off, all vents remain open.
- But when just the bedroom thermostat calls for heat and the main doesn't, the dampers close to redirect the heat to those rooms only.
I have 7 vents in the main house and 5 in the bedrooms. I figure I can install a mechanical damper to control overpressurization if that becomes a problem. The real trick is something to control the logic. The electric dampers will run me around $400 for the 7 that need controlling so even another few hundred would be worth it for comfortable rooms. Any ideas?
EDIT: I have been thinking about this a lot the last few days and have bounced it off some especially handy family members. I think I may have some solutions...
I was thinking about it backwards. I would install dampers that are usually closed vs open. When power is applied, they would open. So when the main house calls for heat, the dampers open and heat goes all over the house (although mainly on the first floor). When the second thermostat in the bedroom calls for heat and the main doesn't the dampers would be closed and heat would pump towards the bedrooms.
It turns out wiring two thermostats in parallel isn't such a big deal as long as they are both set to heat or cool and if I install a backflow damper, I can ensure I don't do damage to the hvac system.
So I just need to wire the main thermostat to not only the furnace but also to a power panel that opens up the dampers
No computer controller needed, right? What am I missing?