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56 Posts
Hi All
My house has a converted attic that has very little headroom. I'm drawing up plans to remove roof, put in 8 foot walls and a new roof. All good on the framing and loads (spoken to a few architects and they say everything's good and I will have them draw up plans for permit).
I'm trying to finalize budget and need to to determine my HVAC approx costs
House is 3 floors. Finished basement, main floor, 2nd floor. Currently basement and first floor are about 1000 sq ft (basement has about 250 sq ft of unconditioned space for large mechanical room and where main stack is, so really only 750 sq ft).
2nd floor is currently about 640 sq feet, but will become about 1000 sq feet.
There is a single HVAC duct from basement to 2nd floor which is then split. AC on 2nd floor is terrible (largely do to poor insulation). I will be insulating roof to R49 and walls to R21
My furnace is AUH2C100A948VAA (100,000 BTU, 95% efficient, 2 stage).
My AC is Carrier 24ABB336A0031010 (2 TON?)
One of the architects suggested putting 2nd HVAC on 2nd floor or in attic. If i have to spend the cash on extra capacity, I will, but if I do, I'd prefer to keep it in basement (mechanical room is 160 sq ft so tons of space and I have the existing duct work to 2nd floor, which can be made bigger if necessary)
So I have 2 questions.
Thanks
Mark
My house has a converted attic that has very little headroom. I'm drawing up plans to remove roof, put in 8 foot walls and a new roof. All good on the framing and loads (spoken to a few architects and they say everything's good and I will have them draw up plans for permit).
I'm trying to finalize budget and need to to determine my HVAC approx costs
House is 3 floors. Finished basement, main floor, 2nd floor. Currently basement and first floor are about 1000 sq ft (basement has about 250 sq ft of unconditioned space for large mechanical room and where main stack is, so really only 750 sq ft).
2nd floor is currently about 640 sq feet, but will become about 1000 sq feet.
There is a single HVAC duct from basement to 2nd floor which is then split. AC on 2nd floor is terrible (largely do to poor insulation). I will be insulating roof to R49 and walls to R21
My furnace is AUH2C100A948VAA (100,000 BTU, 95% efficient, 2 stage).
My AC is Carrier 24ABB336A0031010 (2 TON?)
One of the architects suggested putting 2nd HVAC on 2nd floor or in attic. If i have to spend the cash on extra capacity, I will, but if I do, I'd prefer to keep it in basement (mechanical room is 160 sq ft so tons of space and I have the existing duct work to 2nd floor, which can be made bigger if necessary)
So I have 2 questions.
- Are these units big enough for 2750 sq ft?
- If I install HVAC for 2nd floor, will it be effective if I have furnace in basement and a single duct to 2nd floor attic and distribution from there?
Thanks
Mark