I no longer use split systems. They are no longer competitive vs. window units. U shaped are very quiet and easy to install for anybody. I use 10,000 btu window ac in my attic piped into the old central ducts. MUCH MUCH easier to blow in fresh air for the condenser, than the old school split freon lines. After 7 years of testing, i'm going with a 12,000 btu Artic King that costs $219, in the attic NOT a window. This cools 3 rooms.
Low load applications like you describe San Francisco is a poster child for low applications both in summer and winter. The majority of old homes have small, narrow attic spaces. That have skylight openings that can be used as returns.., The low profile ducted mini splits can tap into those areas be put into the attic space with some very good large oversized surface area 13 or Merv 16 filters . Where the living space is only 980 ft.² to 1280 ft.² are extremely common in San Francisco. And 9000 BTUs to 12,000 BTUs is all that is needed.. 18,000 BTUs is pushing it on the high end for the average low load to be split up between 2 to 3 bedrooms and a living room. But yet I see the average contractor installing 3 tons and 4 tons in San Francisco homes . San Francisco Winters are in a Goldilock efficiency operating zone for heat pumps for winter.
Thanks for making this video. Exactly what I was looking for.
Glad to help. Tell us one new thing you learned.
This one makes sense. A 2400 sf passive house only requires a 2500w system, so distribution matters. ❤
I no longer use split systems. They are no longer competitive vs. window units. U shaped are very quiet and easy to install for anybody.
I use 10,000 btu window ac in my attic piped into the old central ducts. MUCH MUCH easier to blow in fresh air for the condenser, than the old school split freon lines. After 7 years of testing, i'm going with a 12,000 btu Artic King that costs $219, in the attic NOT a window. This cools 3 rooms.
Window heat pump?
Low load applications like you describe San Francisco is a poster child for low applications both in summer and winter.
The majority of old homes have small, narrow attic spaces. That have skylight openings that can be used as returns..,
The low profile ducted mini splits can tap into those areas be put into the attic space with some very good large oversized surface area 13 or Merv 16 filters .
Where the living space is only 980 ft.² to 1280 ft.² are extremely common in San Francisco. And 9000 BTUs to 12,000 BTUs is all that is needed.. 18,000 BTUs is pushing it on the high end for the average low load to be split up between 2 to 3 bedrooms and a living room.
But yet I see the average contractor installing 3 tons and 4 tons in San Francisco homes .
San Francisco Winters are in a Goldilock efficiency operating zone for heat pumps for winter.