"scorpster" wrote:

I saw both single and double pipe models at Costco. I think one is 10,000
BTU the other one 14,000 BTU. Just curious why is single pipe so bad?
Because of the lower BTU or is it less efficient with electricity?

It takes air from the room and then vents it outside. That causes
outside air to find its way into the home. The ones with two hoses,
uses one for the air intake and the other for the exhaust.
--
Jim Rusling
More or Less Retired
Mustang, OK
http://www.rusling.org