hvac sizing

[newblade]

I know manual J is what most people are going to say. I am just curious if a new home in KY with cellulose in walls and ceiling at r50 and it has 1988 square feet in it could get by with a 2.5 ton system. one trey ceiling and on 18x18 cathedral ceiling. An opinion>>>>

Thanks

[lowridemazb2200]

I live in North Carolina, my house is a 2235 square feet. I have a 2.5 ton ac unit in my house. Mine does great. It is a track house so everything far as the insulation in house is at bear minimum.

[jrbenny]

I know manual J is what most people are going to say. I am just curious if a new home in KY with cellulose in walls and ceiling at r50 and it has 1988 square feet in it could get by with a 2.5 ton system. one trey ceiling and on 18x18 cathedral ceiling. An opinion>>>>

Thanks

Could be over; could be under; could be right.

It all depends the direction and number of windows.

I've seen a 2000 sf ranch take 5 tons because of huge SW glass exposure.

I've seen a 2000 sf ranch take 2 tons.

Only the a proper load calculation will tell.

[beenthere]

You can guess, and waste thousands of dollars to be miserable.
Or you can have the load calc done, and be comfortable.

In another thread, there is a member with 4000 sq ft home, he has a 2 ton A/C. It might even be over sized a little.

[Airmechanical]

there is a member with 4000 sq ft home, he has a 2 ton A/C. It might even be over sized a little.

.

[beenthere]

Screen name paul42.

[mbarson]

Will anyone consider infiltration? Let's guess... it's tight.

[newblade]

Thanks for the replies. Does anyone know if there is an online manual j calculator that you don't have to download or an explanation of how to do it manually? Also anyone know the numbers for KY?

[jrbenny]

Why isn't your contractor doing a load calculation?

[beenthere]

No.
But it doesn't take long to download teh hvac calc program.
Plus you can then use it to see if adding first would decrease the size of the unit you need.

[Skip 2 my lou]

Is there anyone here who is a master of percision guesswork? I'm a pretty good guesser, but haven't recieved my MGL yet.

[newblade]

Sometimes you need to do things yourself so that you know they are done correctly.

[jrbenny]

Who's your contractor? I might be able to provide some insight.

Don't post it. Shoot me an email.