How much a blower door costs depends on whether you are buying equipment or paying for a test. Professional blower door testing as part of an energy audit typically costs $200 to $600 for a single family home, often bundled with infrared scan and written report, with some utility programs offering free or subsidized audits for $100. Standalone blower door tests for code compliance for new construction may cost $200 to $400. If you want to buy a blower door system, professional grade systems from manufacturers like Retrotec and Minneapolis Blower Door cost $2500 to $4500 for the fan, frame, digital gauge, hoses, and carrying case, with calibrated models required for code compliance costing toward higher end. Used blower doors can be found for $1500 to $2500. For contractors doing many tests, the investment pays back quickly. DIY low cost methods using a box fan and plastic sheeting are not accurate enough for official testing. Some tool libraries and weatherization agencies rent blower doors for $50 to $100 per day. For homeowners, paying for a professional test is usually more cost effective than buying equipment unless you are a contractor, energy auditor, or building performance professional who will use it regularly.
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