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re: Ways to keep house cool while waiting to repair AC situation.
Posted on 6/17/23 at 1:05 pm to Jon A thon
Posted on 6/17/23 at 1:05 pm to Jon A thon
quote:
We are pretty sure the culprit is the roof ventilation, but it'll take time to clarify. Not worried about system sizing, light fixtures, or the like. We know it operates properly under the conditions of the house usually. Either simethings broken or the roof ventilation was adjusted incorrectly. We had powered fans before, so know it's not just that. But may be installed improperly. I have people looking into it all. It just takes time. And during that time it's hot.
Clearly if the only thing that’s changed is the roof and roof ventilation then that’s the area to focus on. You being an engineer and having taken some HVAC classes, you can check your temperature split yourself by measuring temperature in the return plenum and supply plenum, if you are getting a split of 16-20 F then you can take some comfort in knowing the HVAC equipment is working properly. I would assume the techs would be doing that in addition to measuring refrigerant pressures, superheat, and subcool.
Sounds to me you doing everything practical that you can - I doubt if you could rent window ACs cheaper than buying but you could check, plus your cooling of the roof and bricks with water.
How’s the humidity upstairs? Around 50% or is it substantially higher? If in the 60-70% RH range lowering it with a portable dehumidifer will help with comfort even at higher temperatures.
Honestly though, if you are hitting 85F in the house in the PM with the HVAC operating it really sounds to me to be more than just a attic ventilation problem.
This post was edited on 6/17/23 at 8:30 pm
3
Posted on 6/17/23 at 3:03 pm to CrawDude
Just a thought....
As CrawDude said, something is just not right. So thinking out side the box.
Could some of the inlet air duck insulation have come loose and get sucked up against the cooling coils? This would block air flow coming out of the unit and not cool the upstairs. ie. the air vent temperature would only be 5 or 10 degrees cooler that the inlet temperature.
In my house, the A/C filter is in the hall and I can stand on a ladder and see the A/C coils. Also, while looking at the coils, look at how the cooling coils fit up next to the duck. Years ago, I had a new coil installed. When I changed the air filter a month later, I notice a "big" gap where I could stick a finger in the gap. This allows air to bypass the cooling coils.
Had to get the company to come out to correct this problem.
Several people talked about possible air duct leakage. Also need to look at possible air leakage from the plenum coming off the unit.
As CrawDude said, something is just not right. So thinking out side the box.
Could some of the inlet air duck insulation have come loose and get sucked up against the cooling coils? This would block air flow coming out of the unit and not cool the upstairs. ie. the air vent temperature would only be 5 or 10 degrees cooler that the inlet temperature.
In my house, the A/C filter is in the hall and I can stand on a ladder and see the A/C coils. Also, while looking at the coils, look at how the cooling coils fit up next to the duck. Years ago, I had a new coil installed. When I changed the air filter a month later, I notice a "big" gap where I could stick a finger in the gap. This allows air to bypass the cooling coils.
Had to get the company to come out to correct this problem.
Several people talked about possible air duct leakage. Also need to look at possible air leakage from the plenum coming off the unit.
Posted on 6/17/23 at 3:33 pm to CrawDude
Again thinking outside the box....
On the outside unit, Is the air coming off the fan fairly hot and is the fan blowing good?
If the fan is not working properly.... could be your problem? While out there, check the inlet and outlet freon lines. The larger inlet line should be cold and the smaller outlet line should be hot.
Also, IIRC you had the coils cleaned a year ago. Might help some to clean them again. A gallon of coil cleaner will last many years. This reminds me, I need to clean the outside coils. I cleaned the inside coils about 2 months ago. The inside coil had a "black" color build up block a little of the fins. Note: "INSIDE" coil cleaner did not take the black stuff off. I had to use the "OUTSIDE" coil cleaner to get it off. And yes, I rinsed it really good and then lowered the temperature setting for a while to rinse it more for a while running the A/C.
On the outside unit, Is the air coming off the fan fairly hot and is the fan blowing good?
If the fan is not working properly.... could be your problem? While out there, check the inlet and outlet freon lines. The larger inlet line should be cold and the smaller outlet line should be hot.
Also, IIRC you had the coils cleaned a year ago. Might help some to clean them again. A gallon of coil cleaner will last many years. This reminds me, I need to clean the outside coils. I cleaned the inside coils about 2 months ago. The inside coil had a "black" color build up block a little of the fins. Note: "INSIDE" coil cleaner did not take the black stuff off. I had to use the "OUTSIDE" coil cleaner to get it off. And yes, I rinsed it really good and then lowered the temperature setting for a while to rinse it more for a while running the A/C.
Posted on 6/17/23 at 3:38 pm to CrawDude
Again thinking outside the box....
On the outside unit, Is the air coming off the fan fairly hot and is the fan blowing good?
If the fan is not working properly.... could be your problem? While out there, check the inlet and outlet freon lines. The larger inlet line should be cold and the smaller outlet line should be hot.
Also, IIRC you had the coils cleaned a year ago. Might help some to clean them again. A gallon of coil cleaner will last many years. This reminds me, I need to clean the outside coils. I cleaned the inside coils about 2 months ago. The inside coil had a "black" color build up block a little of the fins. Note: "INSIDE" coil cleaner did not take the black stuff off. I had to use the "OUTSIDE" coil cleaner to get it off. And yes, I rinsed it really good and then lowered the temperature setting for a while to rinse it more for a while running the A/C.
On the outside unit, Is the air coming off the fan fairly hot and is the fan blowing good?
If the fan is not working properly.... could be your problem? While out there, check the inlet and outlet freon lines. The larger inlet line should be cold and the smaller outlet line should be hot.
Also, IIRC you had the coils cleaned a year ago. Might help some to clean them again. A gallon of coil cleaner will last many years. This reminds me, I need to clean the outside coils. I cleaned the inside coils about 2 months ago. The inside coil had a "black" color build up block a little of the fins. Note: "INSIDE" coil cleaner did not take the black stuff off. I had to use the "OUTSIDE" coil cleaner to get it off. And yes, I rinsed it really good and then lowered the temperature setting for a while to rinse it more for a while running the A/C.
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