I took a heater box out of a old car and instead of Hot water I ran cold well water through it. The air came out at about 60 degrees F it worked great. Now basking in the breeze from my Fedder A/C Ken and the Chew Crew Kenneth A. Crips W7ITC, AMI 873 with Irish Terriers Chic' Beezie and Cowboy. In this house Vacuum Tubes still rule.