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I know that it might depend on a lot of things like:
-how air tight is the house
-how old it is (insulation, windows etc)
-what windows are installed -BTW I have casement window
-outdoor temp (currently 86F)

Please just give me a rough estimate or ask me more questions to narrow down the posibilities The house is more like 1900 sqf actually and downstairs is colder... 75F

Here are the settings that I received from HomeDepot at my request This is a Trane XR16-018 (not sure about the last three digits) enter image description here

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As written this question is pretty hard to answer. It sounds like you're having AC problems tho and need a test method.

Find or purchase 2 probe type thermometers like thermometers. Analog or digital doesn't matter, the only things that are important are that they have a probe and that they give the same reading laying next to each other on a table (you will be surprised how many don't). You can purchase these many places for under $10, there normally used in the kitchen. example of probe thermometer

Take these to the area of your furnace and find someplace to stick each in, one in the return air, one in the supply air. There is always a crack or hole in the ductwork somewhere, I have yet to see a case where a hole needed to be made. On the return air side, the simple place is where the air filter is located. The supply side is harder to find sometimes, but just get the probe into the airflow.

Once the system has been running 15-20 minutes the thermometer should be reading temps about 15-20 degree's difference.

example

If your aren't getting 15-20 degrees of cooling you may need a service man, but check the filters first, and check airflow on the outside coils as well. They typically need to be hosed off once or twice a year.

  • I already have this ebay.ca/itm/… and I can tell you that at the supply registers I have like 17C and at the return registers I have like 25C at the return with the set temperature 80F (the damn AC thermostat is in Fahrenheit only) The furnace is brand new but probably slightly undersized (1.5 tons for 1900sqf, basement + main floor). The basement is really chilly but for the main floor in very hot days like today the AC has to work longer I guess – MiniMe May 28 '16 at 22:06
  • You may have a balancing problem then. A service man can check air velocity at various registrars and make minor adjustments via dampers in the ductwork (different than register dampers) The fan speed may also be set to high or too low. Was it professionally installed, if so the installer should have made these adjustments. – Tyson May 28 '16 at 22:12
  • Yes it was, an Ontario Enbridge installer working for HomeDepot part time did the work, I have 10 years warranty parts and labour, I can call them back any time :-) See the update of the initial post for more info and settings. I have not checked them – MiniMe May 28 '16 at 22:49
  • I'd call them back. Sounds like it needs some balancing. – Tyson May 28 '16 at 22:50
  • No balancing possible, I have no supply and return dampers. It is a finished basement but as much as I can see there is nothing like that. They can probably be installed in the furnace room, where the return and the supply are visible and in reach – MiniMe May 28 '16 at 22:52

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