Hi, I currently have a 20 year old York Furnace Model P3U5DIZN08001A/ECTM061628 and it's about had it. I got quotes from several contractors in the area who quoted prices on a new unit ranging from $4K all the way up to $15K. I found a listing on my local craigslist for a 3 year old NorDyne package Gas Furnace with Air Conditioner model GR4GA-042K096C for $750 in perfect working order. Both are 3.5 tons - will the NorDyne work in my house? Thanks for your help!

Here is a link that might be useful: NorDyne Spec Sheet