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I checked the AC outside, and it seems to be working fine. My AC is not helping the house temp to go below 75 degs (f). I have currently set it at 70 degs (f). Downstairs is a bit cooler, but upstairs (first floor) is really hot.

Don't know what to do ...

The vents are blowing cold air, but still the temp is stand still at 75 degs (f). It goes down to 70 at night, but not in the day time.

Any suggestions/ideas?

I'm having this problem right now too. Same issue a year ago. Last year it was a refrigerant leak from loose nut. Caused ice buildup on the coils inside the furnace. If you feel around the furnace and feel a frozen area, could be your issue.
Need to figure out my current issue still.

I'll second everything in egocentric's list, plus add:

basement door closed?

and:

close drapes/window coverings in the room where your thermostat is, and on any south-facing windows in particular but the more the better.

As was stated earlier check for ice on the refrigerant lines. Here's a good diagnostic checklist:
http://www.air-conditioning-and-refrige ... ezing.html

If that's good then move to closing the vents in the basement, then the window coverings, close the basement door to help get a better pressure differential between the upper and lower floors so your return air system works better and draws in the hot air from the upper floors back down to the basement. Then check your basement furnace ducting to see if there are any obvious leaks at joints and tape those up. Close vents in rooms on the main floor like bathrooms and the laundry room, and reduce the opening size on other rooms to maximize the air flow going up to the second floor.

I have tried all of that, but it is still the same. I don't know if there is poor insulation ... it may be ... but I have no way to check that.

As for low refrigerant, I will try checking the furnace line for freezing ... I checked the AC outside, and found a bit of cooling and water where the insulated pipe is, but didn't see any frosting or ice buildup.

Do you know if I call a professional to check the refrigerant, how much would they charge? Any ideas?

Also, our AC was purchased from the builder ... from Applewood, does anyone know how long is the warranty? We've been in our house for 2.5 years now.

We've discovered under our bay window there is ZERO insulation. This causes our heat to run almost constantly in the winter and it even seems like the AC is running more than it should, but it does get cool.

We have to cut out our bay window base from the inside and put proper insulation...another item to add to the checklist...

Same problem happening with my house since yesterday. It usually runs on schedule and works fine. As yesterday was holiday and we were at home, I set my A/C to 22.5 degree C from 24. After 2 hours it was 24. So I started investigation. I checked air and it was cold, I checked all windows and doors and all were closed. I changed air filter (even though old was fine). In the night, it went up to 25. It was too late in the night so didn't call my A.C company and decided to sleep. When I woke up in the morning, it was 22.5 degree. Not so sure if it is still working or not as we are not at home but when I saw 22.5 in the morning, I think my A.C. is working as it was.

Had a problem last year and they have to change entire unit at one point.

And I also do not have any insulation under my bay window, is it an issue?

My A.C not working again and I found ICE on outer side of the pipe. I have shut off the system and need to wait for 24 hrs to melt ice. Don't know the reason for frozen A.C but once it is melted, I will re-start and monitor if it froze again or not.

This sounds like a job for Mason from Nisan Air. My house is too cold!

74F is too hot for me, as upstairs gets to 78F if I set the thermostat to 74F. I need it to be atleast 72F or even better 70F.

My AC pipe used to freeze uptil last year, and I saw ice build up. Applewood came in (after two visits), they figured out that there is some kind of switch that prevents AC to be running while building ice on pipe, that switch was never installed. So, they guy told me that he installed the switch.

Since then it was fine, but this year, the cooling has gone low. I wonder if I have a refrigerant leak, but I have no way to confirm unless I call an AC guy to look at it.

I know it is an issue for us - our dining room is hot in the summer and ice cold in the winter, and our thermostat is like 3 feet from the dining room so the AC and heat are running almost constantly.

I ran the same problem as "rino" is facing. I figured out that there is a disconnnection between thermostat and the cold air blown out of the vents.

I changed the batteries of thermostat and surprisingly it worked for me. I take proud of myself to be so technical

There are batteries in the the thermostat? See you learn new things everday on HV'er forums. I'll try that tonight when I get back home. Thanks for the advice.



My first reaction was to change the air filter. It wasn't that much dirty, but I still replaced it. No difference at all. The air flow problem, I can see air coming through the vents in all rooms, but still it doesn't change the room temperature. Yesterday, as the outside temp was low, the house cooling was no problem, but in hot summer days, the AC doesn't help that much.

My house is approx 2000 sqft, and the AC is 2 tons.

I am not sure of insulation part, but as I have heard on other threads, I am guessing, I am in the same boat of poorly insulated houses as other people here.

Did you try changing the batteries? I am pretty confident that will solve your problem. Before going into some other direction of blaming insulation, AC malfunction, furnace issue etc etc... simply try changing the battries first

The link below shows how to change batteries.
http://www.youtube.com/watch?v=KcC9CpGblqU

Thanks for posting the video Yahooo. It really helped me understand how to change the batteries. I did change the batteries, and seems like it has helped, but I can't be 100% certain yet as the temperature outside has dropped in last couple of days as well. I'll keep an eye on it.