We live in fl so it was very interesting living with that.
Upstairs smells like attic.
When air blows through the system it circulates the smell from the mold source and your entire house gets that musty smell.
Ceiling which is now connected to the attic.
I recently reinsulated and weatherstriped without results.
Musty moldy smell this one is usually much easier to find this smell is associated with water moisture in the system leading to mold growth.
See mystery smell below for more on this.
Run a large fan in the window facing out to draw air from the attic.
Most is hvac driven.
Spray an air freshener in the room if needed to make the attic a tolerable space to work in.
You can easily determine this problem if you stick your head in the attic and sniff.
Open the windows of the attic if possible to vent the air trapped in the attic out and allow fresh air to come in.
If it smells the same that s your problem.
Gable vent in end of outside wall high up in peak end.
But i don t know what squirrel urine or feces smells like.
Where those wires punch through to the attic are rarely sealed properly or at all and that is just one more path for hot air to travel down into your house bringing that lovely odor with it.
Look for an areas in your ceiling that have changed colour.
Sealing up your building envelope is the only way to go.
I thought there might be air flow from the attic into the house through the attic access.
What your house duct system.
If you do not have any of these your attic gets really hot and that smell travels through electrical outlets switches.
Emily tack from usa on march 15 2015.
Air is being drawn in from attic into house via openings in the.
There are two things happening.
On cool days no smell but when the attic gets hot the one bedroom has the smell.
If yours is a loft or attic bedroom you could be dealing with a leaking roof that is damaging the ceiling which is growing mould in the process of absorbing the water.
There are other holes as well like where the wire from your light switch travels up into the attic.
Whenever the air is on upstairs the upstairs smells musty and has that attic smell the furnace is in the attic but the smell isn t that bad when the heat is on.
Oh i am very familiar with the smell of rotting fruit rats that died in our attic.
Are telling you is that you have a failure somewhere.
Let alone there should be a plate barrier between me and upstairs and the attic gable area.