Attic heat loss diagnostic
Rooms Too Cold in Winter
What you see outside often starts inside the attic.
The short answer
A room that stays cold with the heat on is usually losing more heat than the rest of the house. The three common reasons are air leaking out through the ceiling and attic hatch, attic insulation that is thinner than it looks, and heat that never reaches the room. Which one it is comes out of the quote on your own attic, not out of the symptom.
Heat leaves through four places.We check every one.
A cold room is the end of a path, not the start of one. The envelope has four weak points, and which one matters is decided in your attic, not on this page.
- 1One roomAttic inspection above that specific room
- 2The upper floorDepth measurement at several points in the attic
- 3The wallsInterior surface check and thermal imaging
- 4The floor lineBasement or garage ceiling inspection
Reading the evidence
A visible symptom narrows the cause. It does not settle it on its own, which is what the quote on your own attic is for.
One bedroom is colder than the rest of the house
Likely causeAir leakage through the ceiling plane above that room
How we confirm itAttic inspection above that specific room
If confirmedAir sealing
The whole upper floor is cold
Likely causeThin or settled attic insulation across the ceiling
How we confirm itDepth measurement at several points in the attic
If confirmedAir sealing, then an insulation top-up
Cold walls, not a cold ceiling
Likely causeUninsulated or under-insulated wall assembly
How we confirm itInterior surface check and thermal imaging
If confirmedWall and ceiling insulation
The room is cold and drafty near the floor
Likely causeLeakage at the rim joist or an unconditioned space below
How we confirm itBasement or garage ceiling inspection
If confirmedAir sealing at the rim joist
What this page cannot tell you
- Identical symptoms come from different causes. A cold room on the second floor and a cold room over a garage are rarely the same problem.
- Heating system capacity and duct balancing can also cause a cold room, and that is outside what an attic assessment can confirm.
The recommendation hierarchy
A cold room can come from air leakage, insulation depth, heat distribution, or all three at once. Tell us what the room does and we quote the fix remotely.
Primary solution
Air Sealing
Seal accessible gaps and penetrations to reduce drafts, heat loss and uncontrolled air leakage.
Explore this service
Conditional solution
Attic Insulation Top-Up
Use it: if the measured insulation depth is below target once the leaks are sealed.
Conditional solution
Wall & Ceiling Insulation
Use it: if the cold surfaces are walls rather than the ceiling.
About this problem
Questions homeowners ask us.
Everything below is about rooms too cold in winter. Tap one.
Eco-Therma
Usually replies the same day
Will adding attic insulation fix one cold bedroom?
Sometimes, but not always. If the room is losing heat through air leaks, adding insulation on top of those leaks does not stop the air movement. Sealing comes first, then insulation depth is brought to target if it is short.
How do you know which room is losing the heat?
Eco-Therma inspects the attic above the affected rooms and measures the insulation depth at several points. Thermal imaging can confirm where warm air is escaping.
Can this be assessed without visiting?
Yes. A Fast Remote Quote works from your address and approximate attic size — no attic access and no visit to book. Anything it genuinely cannot settle is named as such rather than guessed at.
A practical next step
Request a Remote Quote
A remote quote starts and finishes with your address and the approximate size of your attic. No attic access, no waiting on a visit.