Hello,
We bought a house last winter. It appears the prior owners upgraded the HVAC system just before selling. This is a house built in the late 60s or early 70s. It is 1930sf and has a single return air inlet. We're in Los Angeles 10 miles from the coast.
I have a suspicion that the return air inlet is undersized for the unit that is now installed.
Here is the AC unit that is outside the house: Day and Night n4a560gkc101
Here is the furnace: N80ESL0902120A
I can't figure how many "tons" or BTUs the AC is. I wrote to the company but I have yet to get a response.
Can somebody give me a general idea of how big the return air inlet should be? I'd like to know how far off the mark we are. When I take the return register off and measure the area that is not obstructed by structural beams I get 200 to 250 sq-in.
Thank you for any help,
Oliver
We bought a house last winter. It appears the prior owners upgraded the HVAC system just before selling. This is a house built in the late 60s or early 70s. It is 1930sf and has a single return air inlet. We're in Los Angeles 10 miles from the coast.
I have a suspicion that the return air inlet is undersized for the unit that is now installed.
Here is the AC unit that is outside the house: Day and Night n4a560gkc101
Here is the furnace: N80ESL0902120A
I can't figure how many "tons" or BTUs the AC is. I wrote to the company but I have yet to get a response.
Can somebody give me a general idea of how big the return air inlet should be? I'd like to know how far off the mark we are. When I take the return register off and measure the area that is not obstructed by structural beams I get 200 to 250 sq-in.
Thank you for any help,
Oliver
source https://hvac-talk.com/vbb/showthread.php?2222869-Return-air-inlet-size&goto=newpost
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