Mrcool diy Mini split sizing

[Bent Handle]

I’ve searched around a bit, but was looking for some real world experience. I’m refinishing an old hog shed. It’s 18x30 with an average of a 10ft ceiling. I’m going to spray foam the entire interior with closed cell foam. The 18k mrcool diy says it covers up to 700 sq ft which I would fall under, but is there any benefit to sizing up to a 24k unit? Or is oversizing it make it run less efficiently and cycle poorly? Thanks

 

[SALIV8]

Your location would be very helpful.

What are you sizing for? Heating? Cooling?

 

[Bent Handle]

I live in Iowa, 4 seasons. I’d like it to heat in the winter, which is the most important, but figured if I was dropping money on a heater might as well do a mini split and get cooling also. The shop will be mainly wood working and general tinkering.

 

[SALIV8]

Be very careful of the output at low temps. Many drop off significantly below 25* or so.

For primary heat you may need to go with something like a gree sapphire that has good output at low temps. Almost as good as Mitsubishi. And the sapphire can also throttle down low in ac mode since you will be oversized for ac.

But if if doesn’t get very cold in Iowa, I would at least go with a Mr cool 24k btu system depending on what it can throttle down to in ac mode.