Varinn
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I find it really cool how this forum thread is still going, I just came across it looking to decide if it's worth investing in a new furnace to replace my old ACF-90MD (May 1988, 90k counterflow) Yours would be November 1985, based on the serial number. I understand the AH-75 to be an Airco Highboy 75k BTU from what I read on here. I'm not sure what the MD stands for