What is the price of a blower door system for professionals depends on brand, features, and whether you buy new or used. The most common professional blower door systems are from Minneapolis Blower Door and Retrotec. A new Minneapolis Blower Door Model 4 system with DG-1000 digital gauge, calibrated fan, frame, and fabric panel costs about $3500 to $4500. Retrotec systems range from $3500 to $5000 for similar setup with digital manometer. More advanced systems with both blower door and duct blaster combined kits cost $6000 to $8000. Used blower doors on eBay or from retiring auditors can be found for $1500 to $2500 but may need recalibration costing $200 to $400. For budget or DIY use, there are cheaper alternatives like The Energy Conservatory's basic setup, but professional code compliance requires calibrated equipment. Additional costs include training and certification, BPI Building Analyst certification costs $1500 to $2500, and annual calibration. For homeowners, buying a blower door is usually not cost effective unless you are an energy auditor, as single test costs $300 versus $3500 purchase. Most professionals consider blower door a business investment that pays for itself within 10 to 20 audits.
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