Draught-proofing is one of the cheapest and most efficient ways to save energy – and money – in any type of building. Both draughts and ventilation let fresh air into your home, but good ventilation helps reduce condensation and damp when draughts are uncontrolled (they let in too much cold air and waste too much heat).
Gemini would carry out a draught survey then block up unwanted gaps that let cold air in and warm air out. Saving warm air means you’ll use less energy to heat your home, so you’ll save money as well as making your home snug and pleasant.