What size swamp cooler would you recommend for a 1,500 square foot home? (roof-mounted) 4000 CFM 50% Not sure 50% Get Free Quotes Today! Question: What size swamp cooler would you recommend for a 1,500 square foot home? (roof-mounted) Top Answer (50% of 2 votes): Not sure. Answer: 4000 CFM Explanation: If the duct system is built to handle that CFM. Arizona's Best Heating & AC, Inc. Get Free Quotes Today! Find Local Pros Free Swamp Cooler Installation Cost Estimates Related Questions How Much Does Swamp Cooler Installation Cost? Is it possible to control a swamp cooler with a thermostat?Top answer: No, never Should I install a humidistat with my swamp cooler?Top answer: Not sure Can I install an evaporative cooler (or swamp cooler) in my attic?Top answer: Not sure Can I install an evaporative cooler (or swamp cooler) in my basement?Top answer: Not sure