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Flues can be opened and closed. Leaving them open too wide will draw the warm inside air up the chimney, wasting heat and making the room colder.
Vents (boilers), Breeching (water heaters and modern furnaces)
Chimney Cap Replacement Cost Chimney Cleaning Cost Chimney Inspection Cost Electric Fired Boiler System Cost Ethanol Fireplace Cost HVAC Inspection Cost Home Air Sealing Cost Home Inspection Cost Oil Boiler Cost Propane Gas Boiler Cost Wood vs Gas Fireplace Cost