GBA Logo horizontal Facebook LinkedIn Email Pinterest Twitter Instagram YouTube Icon Navigation Search Icon Main Search Icon Video Play Icon Plus Icon Minus Icon Picture icon Hamburger Icon Close Icon Sorted

Community and Q&A

Another mini split sizing

| Posted in Energy Efficiency and Durability on

Just need some confirmation on sizing.
Location Langley BC, January, February daytime mean temperature:36  F, nite time mean 31F
We have an in-law suite on 2nd floor open concept kitchen and family room with a 9×8 bathroom, there is a bedroom but we do not heat it as it stays between 58-65F.
Square footage to heat 750-800 square  feet.

Presently heated with 2_500 watt and 1 – 1250 watt bb heaters ( 2250x 3413= 7679 btu)
We keep the daytime temperature at 68 , nite time 62, but it takes 2-3 hours to bring it up in the morning.
If it gets in the 15 to 20 F which rarely  happens then we plug in a 1500 watt portable  heater to bring it up quicker in the morning.

I’m looking at a Gree 9000btu mini split specs as follows: cooling cap:9000(1635- 12966), heating cap:9000 (2388 -13648) seer 38, hspf 15

OR: 120000btu cooling cap 1200 (3100-13000), heating cap : 12200(3071- 18766) , seer30.5 , hspf 14.

Most hvac manufacturer sites recommend 9000 btu up to 400 sq feet and 12000 btu up to 600 sq feet .
I’m trying not to over size it as most hvac companies seem to do , looking for it to modulate so it runs at max efficiency.

Am I missing anything here? I think either one would work as they both modulate fairly low.

GBA Prime

Join the leading community of building science experts

Become a GBA Prime member and get instant access to the latest developments in green building, research, and reports from the field.


Log in or create an account to post an answer.


Recent Questions and Replies

  • |
  • |
  • |
  • |