mini split sizing for basement office (how good are todays’ “inverters”)
I’m in NJ, finishing a roughly 350 square foot basement room. Added 2″ of continuous foam board, air sealed as good as I could. Attempted a load calculation with coolcalc.com (but don’t really know what I’m doing!) and it tells me I need roughly 4,600 BTUH of cooling and heating.
I’ve had a number of HVAC contractors all of which just eyeball the space and recommend a 9,000 BTU mini split.
I’d also like to have the best shot of the mini split being able to dehumidify the room without over cooling.
Looking at the specs of these mini split units they have a range of heating and cooling so it looks to me like a 9,000 BTUH nominal unit might be able to modulate down to say 3,000 BTUH or ramp up to 12,000 if needed.
My question is, thanks to this modulating capability, do these units actually work pretty well even if a bit over sized? Should I not worry so much and just go with a 9,000 BTUH unit? I don’t want to be freezing or hot or have the unit cycle on and off all the time, but maybe these units are more robust than other technologies that don’t modulate?
Thanks for any advice or sharing of similar experiences!
GBA Detail Library
A collection of one thousand construction details organized by climate and house part