How much a negative air machine costs depends on size, airflow capacity, and whether it is for professional or homeowner use, ranging from a few hundred dollars to several thousand dollars. Small portable HEPA filtered negative air machines suitable for small mold jobs and homeowners, with 200 to 400 CFM airflow, cost around 500 to 1,200 dollars new, with popular models like the XPOWER X-3400A and BuildClean around 600 to 900 dollars. Mid-size professional units with 500 to 700 CFM that are industry standard for restoration companies, such as the Dri-Eaz HEPA 500 and HEPA 700, Omnitec Design A1200, and Abatement PAS series, cost 1,200 to 2,500 dollars new. Large high-capacity units with 1000 to 2000 CFM for large commercial asbestos and mold jobs can cost 2,500 to 5,000 dollars or more. Rental costs are 75 to 200 dollars per day or 300 to 700 dollars per week from Sunbelt Rentals, United Rentals, and Home Depot Tool Rental, which is often more economical for one-time use. Used machines on eBay and Facebook Marketplace can be 30 to 50 percent cheaper but may need new HEPA filters that cost 100 to 300 dollars each. Operating costs include filter replacement every 6 to 12 months and electricity at 300 to 800 watts. For professional mold remediation over 10 square feet, insurance often covers rental, and IICRC standards require certified HEPA units with pressure monitoring, so renting a certified unit with documentation may be better than buying a cheap non-certified purifier.
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