A/C Output temp

[bakin7005]

Is 59 reasonable when it's 102 out?

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[Tracy moss]

Very reasonable

[Gunnyart]

Dang good

[Marco]

Excellent.

[doghouse]

Great. My ac guys say 20 degrees below the outside temp is normal. Who knows. I prefer 70 yer round.

[bboswell]

Great. My ac guys say 20 degrees below the outside temp is normal. Who knows. I prefer 70 yer round.

This is what I always heard, 20 degrees less than ambient

[airehead]

What is temp at return air ?? (The other end)

[timoub007]

20 degrees below the return temperature is the norm for a properly operating system. What's your return temperature?

[critter69]

Check the temp. of your return air( at a return register) then take the temp of your supply air ( at a supply retester ) you should have 17-21 degrees difference ( delta t) And yes 20 below outdoor temp. is a general rule of thumb.

[acearrow]

Check the temp. of your return air( at a return register) then take the temp of your supply air ( at a supply retester ) you should have 17-21 degrees difference ( delta t) And yes 20 below outdoor temp. is a general rule of thumb.

this exactly if we are talking home a/c units

[FIRE59]

Not to Hi-jack the thread but similar issue, return air temp 73, supply air temp 65-71 depending on which register. Also inside humidity level stays 65-72%. Thermostat set to 70 which it only gets to that in the middle of the night with a portable A/C in use as well. Otherwise it never gets below 73 during the day. Any ideas on what may cause these issues?

[be12hunt]

Not to Hi-jack the thread but similar issue, return air temp 73, supply air temp 65-71 depending on which register. Also inside humidity level stays 65-72%. Thermostat set to 70 which it only gets to that in the middle of the night with a portable A/C in use as well. Otherwise it never gets below 73 during the day. Any ideas on what may cause these issues?

Your unit is running very inefficiently. You are only getting a 2-8 degree delta which is basically nothing. Could be improper charge on the unit, dirty coils, improper airflow, etc.

[ktex]

If its 100 deg outside, thermostat is set to 74 deg but reading at 80 deg = is this is normal due to 20 deg delta?

[bakin7005]

Check the temp. of your return air( at a return register) then take the temp of your supply air ( at a supply retester ) you should have 17-21 degrees difference ( delta t) And yes 20 below outdoor temp. is a general rule of thumb.

Right now its about 90 outside, return air is right at 70 at the main return register and the supply register is about 54.

[175gr7.62]

If its 100 deg outside, thermostat is set to 74 deg but reading at 80 deg = is this is normal due to 20 deg delta?

The delta T refers to the difference between the return and and the outlets, not outside temperature. If it’s 100 outside and your discharge air was 80 you’d be sweating your testiculars off.


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