Sun room hvac heating and air

Question

I have a screened porch with one side brick and three walls screens. The ceiling is 1/2 inch plywood.  The window guys from window world are coming out in a week or two to install windows and remove all of the screens .  I plan on adding r30 insulation on top of the plywood. I also plan on adding a supply and return duct, tapping off my existing hvac. I'd  like to control it with a separate thermostat and dampers. I would add a 24vac transformer to power the thermostat and the dampers. Really I just need a switch but the thermostat would  keep it from opening the dampers if I forget to turn the switch off. I'd really like some simple ideas or other suggestions.

d.george · Answer

Your idea is full of holes as we like to say. As @Ecnerwal stated in his response, you have an area with a different heat loss and gain from the rest of the house. Just adding a supply and return duct will not provide a good result. It would be great if this idea would solve your problem but I doubt it will. If you live in a warm climate, this will not add enough cooling to be comfortable. If you live in a colder climate the reverse is true. To get the best results, you will need a dedicated unit to heat and cool this area unless you will be OK with what you get otherwise.

Answered by d.george on August 5, 2021

Sun room hvac heating and air

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