The HVAC Industry's most complete reference for replacement sales…

Preston’s Guide lists original manufacturer hvac specifications for air conditioners, heat pumps, gas, oil furnaces by model with factory ratings for capacity and efficiency.

• Calculate the energy savings your replacement hvac units will provide
• Prestons Guide is the only reference of its kind in the hvac industry
• Find original factory ratings for efficiency and capacity on old equipmenl
• Condensers listed up to 10-tons including commercial rooftop units
• Models of 205 makes of gas and oil furnaces…1965-2005
• Determine approximate age of old hvac equipment
• Independently published…(without manufacturer affiliation) supports a much more credible presentation by any hvac contractor
• Models of 240 makes of air conditioners and heat pumps…1960-2005

Now updated database of historical hvac specs through 2005
• as a Printed Book
• also available gas and oil residential boilers…1996-2005

Updates for your old CD-ROM are also available

On-Line via the InterNet, our database is now available to you by subscription…its fast and easy