How big of a mini split

[xrdirthead]

I live just South of Boston and want to know what size mini split I need for my garage. No windows, r-13 in walls and r-30 in ceiling. It is 27x40.
Thanks,
Ed

[Logan_L]

what kind of equipment do you have running in there? how much heat is generated under normal conditions?

[craig1]

do you plan on maintaining it at a certain temp all the time or do you want to be able to cool it quickly when you want to use it

[xrdirthead]

do you plan on maintaining it at a certain temp all the time or do you want to be able to cool it quickly when you want to use it

I will set it around 85 to keep it from getting too hot but I would like to crank it up when I'm working out there.

No high heat tools or anything but I do have 12 foot ceilings.

Thanks!

Ed

[beenthere]

Why not let your installing contractor size it for you.

[xrdirthead]

because i've had 3 different opinions one and a half...two...and two and a half.

[gplant]

because i've had 3 different opinions one and a half...two...and two and a half.

Sounds like you need a contractor to do a heat load calc. Don't guess, be sure.

Glenn

[xrdirthead]

Everyone said they did a load test..who do I believe. it doesn't seem like it should be to tough for a pro to figure out. Is there anyone who could tell me?

[beenthere]

One contractor may be sizing for quick pull down after the garage door has been open, or for when you crank it after not having used the garage for a while, plus for the equipment/machinery you will be using. Might be allowing for ventilation equipment


Some times residencial contractors don't allow for the equipment.

dan sw fla, can do a load calc for youo, he's a designer I think. :)

He will need to know more info then you posted.
Tightness of the structure, construction material, etc. Plus the actual type of equipment you have and will be using. If you have mechanical ventilation, what flow rate it has.

Thats not a smalll garage.

[kuryakin]

Get an inverter unit, that way, a big one will still dehumidify well, and not blast you with heat. Nice and even. And a LOT more efficient!

I've got a 2 ton in my garage, and it's 24x24, and I don't think it's too big. Normally it's off, I just heat/cool when I am working on cars.

Make SURE the doors are insulated, and have GOOD weatherstrips on them. This can make a LOT of difference.

Last I checked (and please, let the others chime in!), the largest inverter minisplit heat pumps I've seen are 2 ton. Maybe someone has larger ones now.

I also added a 5 KW ceiling mounted electric heater. Only purpose was to speed up warmup, which it does VERY well. Reduced warm up time when it's 20ºF outside from an hour to under 20 minutes! I shut it off after that. For the brief period the electric heater runs, I'm not going to sweat its cost. The heat pump maintains temp all by itself.


I live just South of Boston and want to know what size mini split I need for my garage. No windows, r-13 in walls and r-30 in ceiling. It is 27x40.
Thanks,
Ed

[xrdirthead]

Thanks.

I am all set with heat. The floor has radiant and I also have a natural gas heater hanging from the ceiling. I will use the radiant to keep the garage around 50 and blast the natural gas heater to take the chill off.

The mini split seemed like the best idea. I just wanted to make sure it would keep it cool.

It is new construction. 2x4 walls, r13 in walls, r30 in ceiling. No ventilation for any equipment. No windows. there are two insulated 8x10 garage doors on the front and one on the back.

Ed