Inspect windows and doors for air leaks.
How to detect cracks in window and door.
You can usually find them near the edge of the window glass.
Hold a lit incense stick by windows outlets doors and any other suspected areas.
Check to see if the caulking and weather stripping are applied properly leaving no gaps or cracks and are in good condition.
Turn off the furnace and water heater and turn on exhaust fans.
Another option for detecting air leaks is using an infrared thermometer which is a non contact thermometer that can measure the ambient air temperatures around window and door frames.
Check the exterior caulking around doors and windows and see whether exterior storm doors and primary doors seal tightly.
Doors and windows another way to test the seriousness of a wall crack is to open and close internal doors to bedrooms and bathrooms and evaluate whether the doors stick.
Stress cracks can form when there is a large difference between the temperatures inside and outside your home.
The windows cannot withstand the pressure of these scenarios and will crack as a result.
Stress cracks start off small and then expand and grow across the glass.
If smoke blows sideways you likely have a leak.