Your windows can lose their 

efficiency over time, so it’s 

wise to check that the seals 

between the glass, frames and 

rough openings are intact. To 

do so, hold a candle flame 

near the edges while your air 

conditioning unit blower is off. If 

the candle flickers noticeably, it 

could indicate a draft that needs 

proper insulation – or a crack 

that needs repair in order to 

prevent further loss of expensive 

“conditioned” air. Other 

problems that may indicate 

you need new windows include 

moisture-damaged or rotted 

frames, condensation or fogging 

between double glazed panels, 

rattling or sticky operation, and 

poor noise filtering.