I've contacted multiple companies and all the estimates I received had either a 3 or a 2.5 ton AC, except for one who said my duct work cannot support more than 2 ton. So here I am asking for your expert opinion. I'll list of the details I think could be relevant, but if you need more details please let me know.
The house is a split-level w/ basement built in the 1970s. It faces north and all the windows have been replaced with double pane vinyl. Here are the measurements (in inches).
The furnace is in the garage and there is space outside right behind the furnace to install the AC. It was installed last year and is a American Standard 2-stage variable-speed furnace (Model #AUD2B060A9V3VB). The return air duct which enters the furnace pops every time the second stage kicks in (I have a YouTube link, but can't post it since I am a new user). The furnace sits on a 14" high base (return air duct?) and has 21" available on the top for an evaporator coil. I've been told it's barely enough. The return air duct going into the furnace and the duct going out of the furnace are both 24x6. The one and only return for the house is in the basement, is 18x8 and spans 2 joists (not sure if I am using this right but the return is not a metal duct but is instead the space between the ceiling of the garage and the floor of the first floor). The whole house is 1800 sq ft in size and has 11 registers (3 in the basement and 8 in the first floor).
Now the guy who suggested the 2 ton AC took measurements for the duct work and windows which no other person did. I don't know if it's a gimmick or if I should take his word for it because most online calculators are suggesting either a 2.5 or 3 ton. I'd appreciate any insight you folks could provide.
I am in the Seattle area.
The house is a split-level w/ basement built in the 1970s. It faces north and all the windows have been replaced with double pane vinyl. Here are the measurements (in inches).
| North | 70x78 - 1 | 70x70 - 1 | ||
| South | 70x45 - 1 | 70x40 - 2 | 70x34 - 1 | 34x85 - 1 |
| East | 46x40 - 1 | |||
| West | 70x78 - 1 | 70x45 - 1 | 34x40 - 2 |
The furnace is in the garage and there is space outside right behind the furnace to install the AC. It was installed last year and is a American Standard 2-stage variable-speed furnace (Model #AUD2B060A9V3VB). The return air duct which enters the furnace pops every time the second stage kicks in (I have a YouTube link, but can't post it since I am a new user). The furnace sits on a 14" high base (return air duct?) and has 21" available on the top for an evaporator coil. I've been told it's barely enough. The return air duct going into the furnace and the duct going out of the furnace are both 24x6. The one and only return for the house is in the basement, is 18x8 and spans 2 joists (not sure if I am using this right but the return is not a metal duct but is instead the space between the ceiling of the garage and the floor of the first floor). The whole house is 1800 sq ft in size and has 11 registers (3 in the basement and 8 in the first floor).
Now the guy who suggested the 2 ton AC took measurements for the duct work and windows which no other person did. I don't know if it's a gimmick or if I should take his word for it because most online calculators are suggesting either a 2.5 or 3 ton. I'd appreciate any insight you folks could provide.
I am in the Seattle area.
source https://hvac-talk.com/vbb/threads/2227208-Need-help-estimating-the-AC-size-for-my-house?goto=newpost
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