Preston's Guide On-Line is a searchable database containing comprehensive listings for residential HVAC equipment with manufacturer's original factory specifications for capacity, efficiency, years made by 225 brands of air conditioners and heat pumps from 1960-2005 (including small commercial to 10 tons) and forced air gas- / oil-fired furnaces from 1982-2005 and gas- / oil-fired boilers 1995-2005

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