DuckRyder
Thread starter
Thank you, sorry to have been a bit absent.
I have sent a follow up to the two of the vendors requesting some clarifications. The one who quoted 24k/24k has already essentially said "overkill better than underkill".
The two I sent follow ups to it looks to me like one has gone to the low end of the manual J and one to the high end of the manual J.
RE the rest of the house: Its a 4 ton heat pump with an auxiliary natural gas furnace. I've been told by all that it wouldn't be prudent to shut the basement vents/return off. The basement is constantly cooler than the upstairs regardless of temp setting upstairs usually 5-10 degrees F.
as for the Solar heat gain coefficient no one asked for that and i don't know it, the windows are not here yet so they could not have looked. They were told they were LOW-E and double pane argon filled. So I'm guessing they used an average.
I have sent a follow up to the two of the vendors requesting some clarifications. The one who quoted 24k/24k has already essentially said "overkill better than underkill".
The two I sent follow ups to it looks to me like one has gone to the low end of the manual J and one to the high end of the manual J.
RE the rest of the house: Its a 4 ton heat pump with an auxiliary natural gas furnace. I've been told by all that it wouldn't be prudent to shut the basement vents/return off. The basement is constantly cooler than the upstairs regardless of temp setting upstairs usually 5-10 degrees F.
as for the Solar heat gain coefficient no one asked for that and i don't know it, the windows are not here yet so they could not have looked. They were told they were LOW-E and double pane argon filled. So I'm guessing they used an average.