Author Topic: HVAC (heating and AC) question  (Read 65709 times)

Offline jaywhy

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Re: HVAC (heating and AC) question
« Reply #320 on: July 05, 2021, 09:20:50 PM »
Should I get an attic fan?
On 90+ degree days my main floor stays under 72ish but my upstairs is 78+. My house (in NJ) has 2 central AC/heat systems.  One is in the attic and my attic is probably 130 degrees right now. An HVAC guy just told me the unit is fine, but being that its sucking in such hot air, and that the ductwork is in such a hot attic, by the time the air gets to my bedrooms it isn't cold. He said I need a good attic fan installed. Though google seems to say they can cause more problems. Any advice?
Thinking about this as well.
Seems to be a choice between better attic insulation or an attic fan.

Offline knowitall

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Re: HVAC (heating and AC) question
« Reply #321 on: July 05, 2021, 09:28:43 PM »
Thinking about this as well.
Seems to be a choice between better attic insulation or an attic fan.
Yeah from my hour of google research itís either:
A) insulate the attic with sprayfoam or other methods. (And close up all vents?)
Or
B) install an attic fan and more vents if necessary, so the air gets vented outside and the attic doesnít get much hotter than the outdoor temps.
IINM If you have a blower unit in the attic option B is recommended.
Iíd love to hear input from HVAC guys instead of what I see on Reddit

Offline skyguy918

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Re: HVAC (heating and AC) question
« Reply #322 on: July 05, 2021, 10:31:00 PM »
Not asking but just going to vent a bit.

The HVAC system in our new-ish house was installed so badly, such a terrible job. Despite having a new house with a brand new system, and spray foam, the main floor could barely ever cool down, I would have it running on 68 all day and it still wouldn't feel that cool in my house. I finally brought someone last September to check out my house, but instead of inspecting the house, he quickly shoots in some freon and bills me $400, claiming thats all it needed. But my house is hotter than ever. I brought down another HVAC guy a couple weeks ago and he finds that the condenser and indoor units were mixed up, my 3 ton condenser was hooked up to my tenants 2 ton unit, and the tenants 2 ton condenser was hooked up to my 3 ton unit.

Sure enough we swapped out the units and I feel sufficiently-cool air in my house for the first time ever. There were also issues with the ductwork among other things but can't be fixed. It's really sad how poorly these things are built, many HVAC installations that are being performed in Lakewood should not be acceptable by any means.
My brother had this with a general contractor that put in a 2 to 1 mini split for a partial renovation. He crossed up the power wires, which was causing one room's remote to power on its unit but send coolant to the other room, and vice versa. My brother had to diagnose this himself, which he realized by the fact that it only got cool in either room when both indoor units were powered on.

Offline The Metzuyan

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Re: HVAC (heating and AC) question
« Reply #323 on: July 05, 2021, 10:51:21 PM »
Yeah from my hour of google research itís either:
A) insulate the attic with sprayfoam or other methods. (And close up all vents?)
Or
B) install an attic fan and more vents if necessary, so the air gets vented outside and the attic doesnít get much hotter than the outdoor temps.
IINM If you have a blower unit in the attic option B is recommended.
Iíd love to hear input from HVAC guys instead of what I see on Reddit
Why is option B recommended if the blower is in the attic?

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Offline The Metzuyan

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Re: HVAC (heating and AC) question
« Reply #324 on: July 05, 2021, 10:53:53 PM »
I did have a attic fan till recently it helped out somewhat i just upgraded to sprafoam in attic and my ac is working alot better  my attic is cool as well

Curious- would you have an estimate for how much you are saving on energy bills per month?
"Not everything that is thought should be said...."

Offline CountValentine

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Re: HVAC (heating and AC) question
« Reply #325 on: July 26, 2021, 12:54:28 PM »
Have a furnace/AC with the furnace motor running all the time. Want to guess what it was or should I just say?
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Offline aygart

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Re: HVAC (heating and AC) question
« Reply #326 on: July 26, 2021, 01:04:22 PM »
Curious- would you have an estimate for how much you are saving on energy bills per month?
My experience in my old house with an attice fan is that when it broke the energy bills were not that different but the AC struggled to keep up.
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Offline CountValentine

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Re: HVAC (heating and AC) question
« Reply #327 on: July 26, 2021, 01:38:29 PM »
My experience in my old house with an attice fan is that when it broke the energy bills were not that different but the AC struggled to keep up.
If it was struggling then it should have been running more and using more electricity. You would think noticeably.
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Offline CountValentine

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Re: HVAC (heating and AC) question
« Reply #328 on: July 27, 2021, 09:13:26 AM »
Have a furnace/AC with the furnace motor running all the time. Want to guess what it was or should I just say?
It was the 24v transformer. Unless you know how to read a wiring diagram you would never think it was that. $20 on Amazon.
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Offline Joel

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Re: HVAC (heating and AC) question
« Reply #329 on: July 27, 2021, 10:06:03 AM »
Curious- would you have an estimate for how much you are saving on energy bills per month?
Can easily be 25%
Depending how well the current attic floor insulation is installed.


Offline davidd75

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Re: HVAC (heating and AC) question
« Reply #330 on: December 21, 2021, 10:15:55 AM »
weird last night in NJ my central heat was not blowing out any air upstairs unit so naturally temp dropped to 59(brrrr) so I thought that's it need to call repair man but this morning when I tried again it started blowing air again?

Online YitzyS

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Re: HVAC (heating and AC) question
« Reply #331 on: December 21, 2021, 10:19:14 AM »
weird last night in NJ my central heat was not blowing out any air upstairs unit so naturally temp dropped to 59(brrrr) so I thought that's it need to call repair man but this morning when I tried again it started blowing air again?
Were the filters changed recently? If not, it's possible that there was too much pressure which caused overheating which triggered a one-hour shutoff.

Offline yos9694

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Re: HVAC (heating and AC) question
« Reply #332 on: December 21, 2021, 10:21:16 AM »
Another possibility is the condensate drain line froze and got blocked, but thawed in the morning

Offline davidd75

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Re: HVAC (heating and AC) question
« Reply #333 on: December 21, 2021, 10:22:04 AM »
Were the filters changed recently? If not, it's possible that there was too much pressure which caused overheating which triggered a one-hour shutoff.
it did not work for like 6-7 hrs

Offline CountValentine

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Re: HVAC (heating and AC) question
« Reply #334 on: December 21, 2021, 11:54:10 AM »
Another possibility is the condensate drain line froze and got blocked, but thawed in the morning
These are outside?
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Offline yos9694

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Re: HVAC (heating and AC) question
« Reply #335 on: December 21, 2021, 01:11:13 PM »
These are outside?

Every setup is custom. Some drip to the outside. Some drain into a sink or sump. Either way is possible to become frozen if the drain hose is in an uninsulated space like the attic.

Offline CountValentine

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Re: HVAC (heating and AC) question
« Reply #336 on: December 21, 2021, 01:16:16 PM »
Every setup is custom. Some drip to the outside. Some drain into a sink or sump. Either way is possible to become frozen if the drain hose is in an uninsulated space like the attic.
The installer should know better. It would be like running water pipes in an outside wall.
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Offline nucheiner

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Re: HVAC (heating and AC) question
« Reply #337 on: December 21, 2021, 05:59:05 PM »
weird last night in NJ my central heat was not blowing out any air upstairs unit so naturally temp dropped to 59(brrrr) so I thought that's it need to call repair man but this morning when I tried again it started blowing air again?
Id guess filter wasnít changed and froze over. Was there a lot of water around the unit possibly after it thawed out?

Offline CountValentine

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Re: HVAC (heating and AC) question
« Reply #338 on: December 22, 2021, 05:41:20 PM »
Id guess filter wasnít changed and froze over. Was there a lot of water around the unit possibly after it thawed out?
How would the filter freeze?
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Online sguitarist18

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Re: HVAC (heating and AC) question
« Reply #339 on: December 22, 2021, 05:48:25 PM »
The installer should know better. It would be like running water pipes in an outside wall.

My contractor did this. Did I mention it's in an uninsulated outside wall, when we had demo'd the room to the studs? When I asked him about it, he said that the studs weren't big enough for the official way the insulation is supposed to be installed. Didn't explain why he didn't a) put in whatever insulation he could fit, or b) discuss with me the option of extending the studs so there'd be more space.

Sorry for the OT rant.