how many btu's do i need

[sboxs]

looking to heat and cool my new garage it is 24x30 12 ft ceilings very well insulated plus insulated 16 ft door Will 15000 btu's get it done Thinking of getting this http://ip.smarterwayinc.com:8080/res_systems/PTAC/ge/55h15.asp will it be enough

[JasonK]

Looks like a hell of a lot of money to me. Have you priced an actual furnace? Buddy of mine spent 1300.00 for his 100% Eff. electric model. He is going to heat a two story 41x24 shop.

[cork]

I use a cheap bottle mounted propane heater that is rated at 15,000 BTU to heat my 20x30 garage with 10' ceilings. It knocks the chill off but need to run a long time to raise the temperature above 60 when its real cold ooutside.

[NHCharger]

You are going to heat 8,640 cubic feet.
My shop is 30x50 with 11' ceilings, one 12' door, shop is well insulated. Total cubic feet is 16,500. I needed a 60k BTU Modine heater for mine. Granted I am in NH where the winters are a bit harsher than yours, but I agree with Cork. Your heater might have to run almost full time to keep up. You might want to step up to a 25 or 30k BTU heater.

[OldCarGuy]

I have a 30x50 garage with a 12’ ceiling height that is extremely well insulated and one 8’x18’ garage door. The 64,000 BTU combination forced air furnace AC unit that I installed makes it very comfy. When it was in the teens several weeks back it was cycling off more than on and holding a cozy 75 degrees. It also has 29,000 BTU cooling and has no problem cooling the garage on a hot 90 degree day.

To keep things simple I installed the identical unit in my two 26x38 garages. Needless to say they are both cozy also.

[RonBou]

You need a minimum of 45,000 BTUs for that square footage for an efficient system.

[storts]

I came Up with 48.000,,,and factor in if your welding and heating steel,,and a exhaust fan,for the smoke,,,Good Luck,and Have a Happy and Safe one!!!!!!!!!!!!!!!!!!

[krooser]

You need 60K or so. I COOL 1000 sq. ft. of my shop with an OLD 12K btu window a/c unit.

[sboxs]

thanks but if you read this thread i still don't have a answer
i didn't think $1,200 was alot of money
buying a furnace means duct work and fuel lines ( i don't have gas on site) got to be a lot more than $1,200 plus i still need A/C
its only 720 sqft not 30x50
the walls are 19r plus wood plus brick
so i'm going with it plus i have 2 small propane heaters and a portable roll around A/C unit that i will use to move the temp to a comfort range to use my wall unit to maintain
plus the garage door will rarely be open as this is my workshop to restore my Cuda and storage for the Z06 which is only used on sunny sundays
thanks for all the advice

[fireman]

looking to heat and cool my new garage it is 24x30 12 ft ceilings very well insulated plus insulated 16 ft door Will 15000 btu's get it done Thinking of getting this http://ip.smarterwayinc.com:8080/res_systems/PTAC/ge/55h15.asp will it be enough


My garage/shop is exactly the same size with 12' ceilings and well insulated. I tried a 30,000 BTU propane space heater and it would barely make it tolerable in real cold weather (30 degrees). I just installed a ceiling mount 75.000BTU propane heater (vented to the outside). It heats the garage up VERY quickly and doesn't run very often to keep it warm. Small/undersized heaters have to run constantly to try to keep it warm and if they are non-vented (like a space heater), they have a harder time because you HAVE to keep a window or door open so you don't risk CO poisoning. I researched heater size before I bought mine and everyone I asked said a minimum of 45,000 BTU but 75,000 BTU would be better.

[mtcone]

This garage heater calculator (http://www.ultimategarageheater.com/garage-heater-calculator.php) is an easy way to size a heater for your garage. It will tell you exactly how many BTUs you need and suggest a heater to satisfy your needs.

[04 Navi]

What about a heat pump? Heat and cool in one unit and there is really not too much ductwork needed. Since it is a garage you can get away with the "exposed" look for the ductwork.