Mitsubishi 12,000 btu with hyper heat (mszfe12na)

[newmanab]

First post here it goes!

Finishing a Bonus room for a customer. 16X24 room dims with a 4 ft knee wall 30 degree angle ceiling with a max height of 8 ft. The room is spray foam insulated. i advised customer Mitsubishi 12,000 btu with hyper heat (mszfe12na) should be sufficient for this room size and how well it is insulated. However they had H-vac guy out to quote and he says it needs a Mitsubishi 22,000 btu mini split!!! i thinks it a little over kill... any advise??

climate is Northern Ohio...

give me some advise experts.

[Gunny62]

That's easy, run a heat load calculation and you'll know who is correct!

[newmanab]

i did and came up with right around 11,000 btu's. Just wanted to make sure someone else could confirm this since i am no HVAC Professional.

[spotts]

I would listen to the hvac professional. How cold does it get in O-Hi-O?

[TxTurbo]

Was your heat load 11k cooling or 11k heating?

The contractor may have recommended a larger unit for the purposes of heating the room instead of cooling.

Great system by the way!

[newmanab]

yeah I'm sorry.... that was for cooling (with fiberglass insulation) .... i can i get some help for heating?

[TxTurbo]

16x24, 8ft ceiling
How many, what size and what type of windows?
What's the R-value of the insulation in the ceiling and walls?
What kind of floor is it (crawl-space, cement, basement)?
What kind of flooring (wood, carpet)?
What's the zip code?

With this information I can run a heat load for you. =)

[jpb2]

Fujitsu I might do A 22,000 as well. With the inverter varaible capacity 9900-27300 I wouldnt worry about being over sized in cooling.

[newmanab]

24x16
No windows
walls r-15
ceiling r-50
insulated garage below
carpet on the floor
zip 44883

[TxTurbo]

I'm getting 11k heating, 6.6k cooling.

The colder it gets outside, the less efficiently the mini-split will work. Oversizing the system will compensate for the up to 30% loss in capacity when it gets cold.

I agree with the contractor. A 22k system would be the best option. A 12k would work most of the time, but may not produce enough warm air on the coldest days.

[newmanab]

That's why i was thinking the mszfe12na with muzfe12na with the hyper heat holding efficiency down to the single digits.....

Maybe just go with the bigger size then not disappointed!

[newmanab]

Fujitsu I might do A 22,000 as well. With the inverter varaible capacity 9900-27300 I wouldnt worry about being over sized in cooling.

jpb2 do you have a model number so i can show my customer a variable speed mini split?