re: Difference in HVAC Prices

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Ha, it's 2400 SF and 30 years old. I ain't one if these baws running dual units.

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a 5 ton unit is more than you need for 2400 sq ft. You want the system to fit the house because you actually want it to run enough to ventilate and "condition" the house. They should be using Manual J load calculations which takes into consideration lots of factors like size, insulation, roofing, siding, window type and direction most windows and doors face, etc

edit to say that it's often wise to avoid a contractor that is way lower than others, but if that one contractor is a guy, a helper, and a work van and the other guys are business men or wannabe businessmen with hourly installers, nice building with offices and overhead, and several crews with new vans and trucks, then the difference is obvious. In a case like that you often get a better contractor with the guy that has a helper and a van and works from home. Check with your county inspectors. They may not be supposed to recommend contractors but privately they often will give you a list of 2 or 3 names. At least require references and check them out. Course, a crook will give you references that are often friends and family that he hasn't yet ripped off.