Pick a day when there is a good breeze, and heat the house to its usual temperature. Then wander around with a candle or smoke pen (about £20). Alternatively, buy a thermal leak detector.
This flashes blue for cold, green for normal and red for warm. It can have several causes, including poor ventilation. Older single-glazed windows allow more heat loss, which exacerbates the problem.
If your home struggles to maintain a comfortable temperature, it may be losing heat through walls, floors or the roof. Uneven room temperatures can also be a sign that radiators are not working or heat is escaping faster in some areas. If snow melts quickly on your roof while nearby properties remain blanketed – or it is a hotspot for birds – this can be a sign that heat is escaping.
An older or uninsulated home can lose 25% of its heat through the roof.
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