General topics about all things heating, ventilation, air conditioning and refrigeration.
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Look to who will do the installation and then stand behind their work after it's done. Look at the manufacturer's warranty and the warranty of the installing company. What HVAC company will come out at 2 AM on a cold February night when your system doesn't fire? You need to look at more than just the cast iron. Now if this is an DIY installation, then say so.