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I'm having problem with temps in one of our rooms, half of the room is situated over the entrance to the house, naturally it's just soffit and pink insulation with vapor barrier below that room.
Now rest of the house is 22c on main floor and 21c on top floor, even the room above garage is 21c as they made a pocket between garage ceiling and floor of the room above the garage and they run furnace duct there and it's pumping hot air into the pocket.
The room that is above the entrance to the house is on the other had constantly at 16c and sometimes at 15c, if I leave doors open it's 20c, but once closed it drops to 16c in around 2-3hrs.

Is this something I should complain to the builder about ?

4-5 degrees in a few hours? wow, that's worse than NFL footballs deflating themselves 1 psi in a half.

A few homes ago I had this exact issue - except that room got down TO 8 degrees. They came back in a hurry.
Sometimes insulation is missed completely - see if one of our friendly neighbourhood home inspectors will come by and use their infrared cameras to show you exactly where the cold spots are, and then you have better ammo against the builder.

DEFINITELY call the builder, but you need the answers first or they will just shrug it off.
Let us know what happens!!

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Fred De Carolis
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If your home is past the Tarion period, it's your problem now.

As said, if there is no air return in the room (sounds like there is not one), there's part of the problem. I had someone explain it to me as "you cannot blow air into a bottle". How about installing a pair of grilles over the doorway, or in the door itself if you must keep that door closed.

One factor that I think trumps all, and is my broken record rant, is how poor the builder's basic windows are. Are the windows standard basic items? If they are, you could be losing a lot of heat through them, especially on windy days.

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This one thing probably never goes away
I think this one thing is always supposed to stay
This one thing doesn't have to go away

Some homes needs hot air distribution to be adjusted. Mattamy leaves it as is on closing.

Some Mattamy homes were designed stupidly. Like OP case. Huge windows in small rooms with three walls outside and no attic. And with furnace at the longest distance from this room. The only way to make room like this warm by existing heat source is to re-insulate with modern foam insulation method.

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Let me know if you need a picture or two

we have the hi velocity systems. heating runs entire day and insidse temp never rises more than 18c the bedrooms upstairs are 16c. technician came said nothing wrong thats just mattamy.
you r right small rooms with 2-3 windows. cant wait for summers.

Anyone mention insulation problems yet ? Obviously this can cause cool or cold top floor rooms.

These IR images are from ONE home during a recent 30 day inspection. The dark areas represent areas where insulation is missing and they are cold. This is a result of poor workmanship and a code violation that prevents this. I expect all the homes on this street suffer from the same problem. Some of these cold areas in the photos were visible from the attic hatch but some were not visible. Either way, Infra Red finds them all.

Anyways, this OP's problem is in one room over the porch. If the attic insulation is not a problem in that room then I suspect that the insulation below the floor of this room was not done very well. If there is an Air Return in this room it should be close to the floor, not high on the wall.

Also OP should keep in mind that most rooms have 1 or 2 exterior walls, some have 2 2/3rds exterior walls. This is usually in front bedrooms that "protrude" at the front of the home.

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For Home Inspection services call Andy Shaw at Halton Home Inspection Service. 905 876 4761

If someone buys a house resale that is 12 years old and the home inspector doesnt find this code violation does that mean the inspector is no good and didnt do his job?

Not sure I understand. Not every house has this problem. Are you saying that you discovered this problem after you took possession? Also keep in mind that Infra Red works best during hot or cold weather so there are some times of year in the spring and fall where IR is not very helpful.

According to home inspection standards of practice we are only required to inspect areas that are "readily accessible" so crawling around every attic is not a requirement nor is it a good idea. That's one reason why I have been using IR for so many years. It's a great tool for exposing problems that are not visible.

In your 12 year old home your thickness of attic insulation is probably pretty low and there is a 50% chance the home never did have the right amount.

Shorting homes on insulation is an old and common scam that persists even in todays new homes.

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For Home Inspection services call Andy Shaw at Halton Home Inspection Service. 905 876 4761

We're actually coming up on our 1 year Tarion form, gotta be filled within february.
I'll try to contact them while it's still winter, in spring they might blow of the problem as it won't be that big of a difference.

There really is no "tweak" on the supply side unless something is closed over or disconnected somewhere preventing air from reaching that vent. It should all be wide open, and this would happen anyway. Seems your problem (HVAC-wise anyway) is a missing cold return vent, or any means to properly balance airflows in that room. You mention the room warms when the door is left open, but chills when it is closed....

Your blower cold be undersized as well. Sizing up helped in our situation, especially in cooling season.

_________________
This one thing probably never goes away
I think this one thing is always supposed to stay
This one thing doesn't have to go away

How is the gap between the floor and the door? I know my 3rd bedroom doesn't have a air return vent. With the door closed, and no return vent the heated air has nowhere to go. Like you said, the temperature is back to normal when the door is open. You either need to find a way for air to escape the room, or keep the door open.

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Renfrew - Phase 3

The room is farthest away from the furnace in the house, but holding hand over the vents it blows just like any room, no big difference.
It has 2 vents on floor for heat and it has air return grate high up, almost at the ceiling.
I think this is the insulation problem, above the entrance.