Help choosing right AC size


  #1  
Old 05-13-14, 05:47 PM
A
Member
Thread Starter
Join Date: May 2014
Location: Canada
Posts: 2
Likes: 0
Received 0 Likes on 0 Posts
Help choosing right AC capacity

Hi

i want to install an AC unit on my condo which is 1000 sq ft with 8 ft ceilings.

A contractor suggested a Lennox Mini split system, 12000 BTU unit, and says that it's enough because it can cool down as if it were a 14500 BTU.

He estimated this number just by looking at the apartment, didn't measure anything.

This is the system's information: Ductless Mini-Split Heat Pump | MS8H Mini-Split Heat Pump | Lennox Residential

I've been doing some research and everywhere it says that I should get at least 18000 BTU.

Should I trust him or get an estimate from another company?

Thanks
 
  #2  
Old 05-13-14, 07:25 PM
H
Member
Join Date: May 2014
Location: United States
Posts: 5
Likes: 0
Received 0 Likes on 0 Posts
You need to figure the insulation ,sun exposure , 1st or 2nd floor , double pane glass . If you are good on that you can go smaller . I have an 18000 BTU unit in a 1560 sft home that cools about half of it down hallways .

Also depending how much you use it a high seer number won't make much difference . I used it two months a year so 15 - 16 seer is fine . If you have high Kilo Watt Hour prices and run it all summer the higher seer unit would be a money saver . You never want to go too big as it cycles too fast wasting power .
 
  #3  
Old 05-13-14, 09:08 PM
A
Member
Thread Starter
Join Date: May 2014
Location: Canada
Posts: 2
Likes: 0
Received 0 Likes on 0 Posts
Thanks Heli-tech

Apartment is on the last floor of a third floor building, windows are facing south so I get a lot of sun.

Except for a mezzanine, all the rooms + kitchen are on the same floor. Mezzanine is above the living room and it's an open space, so it's like having a big living room with cathedral ceiling.

There are double pane windows, and isolation I would say it's not bad (I live in Quebec).

System will be installed on the mezzanine.

I'm concerned this system won't be enough to cool down the two bedrooms. I know there will be a difference in temperature between living room and bedrooms but I expect temperature and humidity to reach a level that would allow us to feel comfortable during the hottest weeks of the summer when it can get very humid and hot (89F but can feel up to 100F with humidity)

This system has also a heat pump, and I'll for sure use that more than the AC, probably from November till April (excluding the coldest part of January and February) so I'm interested in having a good SEER.

Do you still think 12000 BTU would be enough?
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: