Split Unit Sizing

[HaroRider]

Hey all, I have a 22' x 30' garage. Cinderblock with 10, foot ceilings to the top of the cinderblock and around 15' at the roof pitch height. Unfinished walls, and 3 garage doors insulated. No windows and the roof is insulated. Also has a steel man door.

Im in NYC and will use it primarily for car work and hanging out.

What size mini split should I be looking at?

1.5 ton, 2 ton?


Thanks, Tom

 

[pcmeiners]

Rather difficult to offer a minisplit size with a garage with no wall insulation. Cinder block offer almost no insulation and NYC electric rates are ridiculous so your throwing money away until you insulate. Decent size garage for NYC, I just moved to PA from Staten Island a year ago.

 

[PoorUB]

Hey all, I have a 22' x 30' garage. Cinderblock with 10, foot ceilings to the top of the cinderblock and around 15' at the roof pitch height. Unfinished walls, and 3 garage doors insulated. No windows and the roof is insulated. Also has a steel man door.

Im in NYC and will use it primarily for car work and hanging out.

What size mini split should I be looking at?

1.5 ton, 2 ton?


Thanks, Tom

Insulate and put in a 1.5 ton.

The block walls are huge heat sink and you will be fighting them all the time. Sun blazing down on the roof just radiates down into the space.

You might need 4 or 5 tons to be comfortable. Nobody knows or will recommend doing this without insulation.

What is it with all the posts in the last couple days with guys wanting to skip insulation???

 

[HaroRider]

Hmmm. Im not totally against insulation but without finishing the walls what viable options do I have?

I really dont want to just glue insulation sheets to the walls.

 

[PoorUB]

Hmmm. Im not totally against insulation but without finishing the walls what viable options do I have?

I really dont want to just glue insulation sheets to the walls.

2x2 furring strips screwed to the walls with Tapcon screws, 1-1/2" Foamular foam sheets in between the furring strips, drywall over that.

IMO, you do not have many viable options other than what method/type of insulation.

Years ago I rented shop space. It had electric heat. The first winter it about broke me and I just about froze to death! The second winter, at my expense I insulated the space. The first winter it was uncomfortable with 15KW of heat running constantly. The second year 5KW heated the space just fine.

 

[pcmeiners]

I wlll up the formular board to 1 1/2" with another 1" covering the furring and 1 1/2" foam board due to the cruel abusive electric rates, then get an idea of you heat/ ac needs with link below. Foam boards are ridiculously expensive but not as bad as the KW costs

Home Heat Loss Calculator

For NYC, both the winters and summer are rough and the electric costs are very high, thus you need a very efficient minisplit with a COP averaging more than 3. Check out the. Link below shows efficient units, a couple of them average a COP of 4, those units are not cheap. Basically with COP of 4 you get 4x the heating or cooling BTUs or each kilowatt of power.

https://www.goodlifehvac.ca/images/Fujitsu_LZ_Series.pdf

 

[HaroRider]

Im in Long Island, Nassau county. Not that the rates are any better lol

 

[mike93lx]

I did a basement with 2" foamular, attached with 1x4 furring strips over the foam (so continuous foam) with spring spikes. Then I drywalled over that

Tommy to the rescue

 

[danski0224]

Anything between 1.5 and 5 tons should work... but it might not.