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Heat in house due to old single-pane windows?

Posted on 5/26/19 at 5:57 pm
Posted by Who_Dat_Tiger
Member since Nov 2015
17786 posts
Posted on 5/26/19 at 5:57 pm
Moved into new home this winter and just over the past couple weeks were noticing that the air conditioner has been running nonstop. No problems before. Paid an ac guy $175 to come out last week and he cleaned the condenser, topped it off with Freon and checked the vents etc... said it is running fine although weve been keeping it set at 75 and temp still just bounces between 77 and 80 all day.

The air coming from the vents feels cool and the “pressure” seems fine too. Nothing seems to be out of the ordinary with the ac. He also said (probably because I mentioned it first) that it is our windows and attic door not being flush causing the heat. Used his thermometer gun and registered the inside window temp at 93 degrees.

Bought an insulated cover for the attic door that’s coming in this week. But not sure the heat throughout the whole living area of the house is really just due to the windows.
We have a ac vent in the living room close to the windows and it doesn’t seem to be any warmer there than in the hallway where the thermostat is.

Could buying new windows really be the only fix needed to get the house comfortable again?

3 large windows in the living room are in direct sunlight the majority of the day. We like natural light and always left our blinds and curtain open but since ac man came last week blinds have stayed shut and curtains over window yet thermostat still bounces between 77 and 80 and ac running nonstop. In the meantime any suggestions to keep the direct sunlight from the windows causing so much heat in the house? If this is the issue don’t get why it’s just happening now and never noticed it on sunny days in March - April. And Raised house fwiw

ETA- and no way I think people have lived in this house through summers with heat in house like this for 25 years without ever replacing the windows if that really is the issue

Edit 2-



100% the windows. Gonna be buying new ones for the whole front of the house
This post was edited on 5/27/19 at 5:58 pm
Posted by Clames
Member since Oct 2010
16639 posts
Posted on 5/26/19 at 6:17 pm to
I have an older house with single-pane windows facing east, they get full sun during the later AM hours and there is significant heat load from that. I really want to replace the windows eventually but for now I'm just going to use a window film to block some of the IR and see if it helps.
Posted by LSU999
Member since Nov 2012
9119 posts
Posted on 5/26/19 at 7:22 pm to
I would say lower the temperature overnight and in the mornings. It will keep it cooler until the evening. I have a porch that leads to my living room and it faces the sun in the evening. I added outdoor blinds to the screen porch to block the sun in the evening and it has helped.
Posted by ItzMe1972
Member since Dec 2013
9824 posts
Posted on 5/26/19 at 8:09 pm to
I have a rent house that is doing the same as yours. Single pane glasses and tuned up HVAC. I do keep the shades or blinds closed when hit with direct sun.

I need to trim a large tree overhanging half the house and am afraid of the consequences if I do.

The previous tenant put a small window unit in the master bedroom.

Edit: Have you checked to make sure none of the ducting has come loose? How is the insulation in the house?
This post was edited on 5/26/19 at 8:20 pm
Posted by hungryone
river parishes
Member since Sep 2010
11987 posts
Posted on 5/26/19 at 8:30 pm to
Can you add awnings to the exterior of the house to shade those problem windows? My last house had double glass doors leading to a concrete patio, with a huge amount of heat gain. I put up a canvas awning with 36” projection from the wall, spanning both doors, and it helped a great deal.
Posted by wickowick
Head of Island
Member since Dec 2006
45822 posts
Posted on 5/26/19 at 8:49 pm to
You can add solar screens to the windows that get the direct sun. It isn’t perfect, but better than nothing
Posted by keakar
Member since Jan 2017
30130 posts
Posted on 5/26/19 at 10:58 pm to
it may look stupid and redneck but covering the sun facing windows with aluminum foil will make a huge difference.

also, replacing the windows is the only real fix, but in old houses they very often dont have any insulation in the walls
Posted by gumbo2176
Member since May 2018
15265 posts
Posted on 5/27/19 at 6:24 am to
My house is old, plaster/lathe walls, 10 1/2 ft. ceiling height, only insulation in the attic, tons of large single pane double hung wooden windows, etc.

The thing that helps save me is all my windows on the top floor, where the main living area is located, has the old cypress functioning wood shutters that I keep closed most of the summer to keep direct sunlight off the glass.
Posted by HighRoller
Baton Rouge
Member since Nov 2011
4248 posts
Posted on 5/27/19 at 7:02 am to
We bought an older home with single pane windows as well. We added insulation to the attic (was not enough) and changed windows. That’s really the only permanent fix.

Call window world or relief windows. Pricing isn’t too bad.
Posted by Zappas Stache
Utility Muffin Research Kitchen
Member since Apr 2009
38786 posts
Posted on 5/27/19 at 8:52 pm to
My house was built in '29 and I have old wood single pane windows. I added a 2nd pane to each window a few years ago and it made a world of difference.
Posted by Spankum
Miss-sippi
Member since Jan 2007
56114 posts
Posted on 5/27/19 at 10:37 pm to
Have you thought about shade screens for those windows that catch all of the sun? They don't look the best, but are pretty effective and don't cost much at all.
Posted by deeprig9
Unincorporated Ozora, Georgia
Member since Sep 2012
64236 posts
Posted on 5/28/19 at 11:38 am to
This is really easy to do a proof-of-concept before spending alot of money. Another poster said foil, another poster said outdoor blinds, do something cheap and temporary to see if it makes a difference for a few days. If it does, then go with the new windows. If it doesn't, you've saved yourself alot of money.
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