Heater sizing question- variables!

[scbird94]

I have a 22x22 with 10ft ceilings that is insulated with r13 in walls and r19 in ceiling, insulated garage door as well.

Last year i purchased a 75k thinking bigger is better, right?

Im about to hang it but im wondering if i shouldnt exchange it for a 45k unit.

I realize the 45k will be plenty big, but minnesota winters are cold... and i do alot of side jobs in my garage, and im wondering if it wouldnt be better to have the 75k so the heat can recover quicker after the door is open to pull a car in.


Most guys would just run a 45k but im not sure if they open their doors as much as i would?

What do you think?

 

[Charles (in GA)]

You do not want a heater that runs for only short periods and shuts off, waits a long time and runs for a short period again. Thats the problem with a oversized heater. You are better off with one that runs a longer period of time. This is what I've always heard, oversizing heaters or A/C units is not good (but undersizing is even worse!)

Charles

 

[krooser]

You need a 45K... I heat 1100 sq. ft. and my 80K radiant tube heater is too big. It works fine but I should have bought a 40-50K btu.

I used to live in a house that was a former feed mill. The owner did a great job of remodeling , insulating, etc. but got a "deal" on a hot water boiler intended for a 4 family.

$600.00 heat bills meant he never kept a tenant more than one winter. He needed a 80K boiler but bought a 175K btu... I was out by May.

 

[Falcon67]

FWIW - the furnace that nicely heats our 3 br 2 bath 1600 sq/ft partially insulated house is a 80K BTU unit.

 

[dawg]

a 100K unit heats my 2750 sqft house just right.
the problem with bigger unit is that it wont run long enough to get rid of moisture.
sure itll work but the life of furnace will be cut in half or more due to corrosion.

 

[marcrolls]

I live in Mn also and am considering the same thing. What about fan noise and quality.

why not buy a 55,000 btu. GET A REBATE for a higher efficiency from the gas co. etc...

I am not going to run mine everyday until below freezing temps everyday then set at about 50 degrees. 45 or 55 will be enough.

the big box retailers limit your size options I am going to buy from a guy who owns the tradewinds heat and ac place in isanti.

Reznor is the brand I am going to buy -the titanium heat excanger, no warranty repairs and quiet fan convinced me to not get a hot dawg or modine or mr heater.