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Message
re: New Construction Home Cooling Issues
Posted on 6/30/23 at 6:32 am to jsk020
Posted on 6/30/23 at 6:32 am to jsk020
I’m by no means a dehumidifier guy, but 72 and low humidity is very comfortable. So I’d also check your humidity.
I’m sure trees will help, and I’d heck your insulation this winter/ fall. But as said that’s not the worst situation.
I’m sure trees will help, and I’d heck your insulation this winter/ fall. But as said that’s not the worst situation.
0
Posted on 6/30/23 at 1:25 pm to jsk020
quote:
I have a new construction home, 1 year old
You're still under the new home warranty act...
quote:
I also had the attic fully insulated after i bought it, the builder put the minimum.
Get his arse back out there.
quote:
Currently during the day it can not get below 72.
Sounds like your builder put in an undersized unit for your home. Had this problem at our old house. Again, call your builder and get his arse out there.
quote:
Is this normal because of how hot it is? Or should it be able to cool the home to the right temp? The ac is basically on all day.
It should be able to cool it to temp.
Posted on 6/30/23 at 1:51 pm to BugAC
We have a exterior 3.5 Ton Goodman GSX140421KF. The interior unit is Alumicoil ARUF47D14AD, says online 3.5 tons but inspection report says 4 ton. Our house is 2100 sq feet and 10 foot ceilings. We have about 13 windows also. Does that seem undersized?
This post was edited on 6/30/23 at 2:03 pm
Posted on 6/30/23 at 2:09 pm to jsk020
quote:
I also had the attic fully insulated after I bought it
I would check to make sure you didn't cover you soffit vents when you insulated the attic. You can also install an electric fan that helps force the hot attic air through the vents on your roof or upper exterior. If the hot attic air cant escape, then it will certainly warm your home and put unnecessary work on your HVAC.
This post was edited on 6/30/23 at 2:10 pm
Posted on 6/30/23 at 5:47 pm to jsk020
If it maintains 75f on the hottest days it is not undersized.
Posted on 6/30/23 at 6:34 pm to jsk020
quote:
We have a exterior 3.5 Ton Goodman GSX140421KF. The interior unit is Alumicoil ARUF47D14AD, says online 3.5 tons but inspection report says 4 ton. Our house is 2100 sq feet and 10 foot ceilings. We have about 13 windows also. Does that seem undersized?
No, it doesn’t seem undersized at all. Size should be calculated by a manual J calculation LINK. The builder may or may not used that. 600 sq ft per ton for new construction following current building codes is very unlikely to be undersized.
My home built in 93, 2500 sq ft conditioned area, has a 4-ton unit, and manual J says 3.5 ton would likely be adequate. 50% 10 ft ceiling, 50% 9 ft. Maybe 16+ windows. My unit is properly sized.
I’m sure the builder put R-30 in the attic, minimum required by code. R-38/R-40 might be better, but probably 90% + of homes in LA have R-30 or less.
Windows are a major sourse of heat loss or gain, particularly south and west facing, so shades, blinds, window coating, awnings, etc could help here.
I bet HVAC techs are making lots of service calls to houses in this extreme heat, where the house is not keeping up with thermostat set point temperatures, and then the tech having having to tell the unhappy homeowner their properly sized system is working fine after having being checked.
This post was edited on 7/1/23 at 1:12 pm
Posted on 7/1/23 at 11:25 am to Shexter
quote:that means the coolest your home will get us 80 a good many days. That can’t be right
think I remember reading that 15-20 degrees
Posted on 7/1/23 at 12:00 pm to jsk020
AC systems for homes have a max differential vs outside temp. If it is 100 outside and you are getting to 75 that is pretty good. 72 woukd be excellent.
You would have 100 degree air flowing through your outside unit trying to remove heat from Freon circulating back to the coils. 100 degree air isn’t going to cool Freon as much as 95 degree air and do on.
There are physical limits to how much cooler the inside can be with even a high end AC system.
Yours sounds pretty damn good TBH.
You would have 100 degree air flowing through your outside unit trying to remove heat from Freon circulating back to the coils. 100 degree air isn’t going to cool Freon as much as 95 degree air and do on.
There are physical limits to how much cooler the inside can be with even a high end AC system.
Yours sounds pretty damn good TBH.
Posted on 7/1/23 at 12:33 pm to Shexter
quote:
think I remember reading that 15-20 degrees cooler that outside temp is considered normal for AC systems.
Nah. The temp coming out of the vents should be 15-20 cooler than the air going into the return. So if the temp inside of your house is 70 your air coming out of the vents will be between 50-55. You are mixed up or got bullshitted by someone.
This post was edited on 7/1/23 at 12:34 pm
Posted on 7/1/23 at 5:54 pm to diat150
Mine is 55 coming out.
Posted on 7/2/23 at 4:32 pm to jsk020
quote:
Also, would tinting the windows help out?
This absolutely helps. I cut my electric bill by $30-$40 per month
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