Ask Adam" Adam has been in the HVAC industry for over 40 years. He has been involved in all aspects of the business from service to sales. His main interest is in customer comfort. How Have Furnaces Changed Over Time? Adam Kern, Owner Official Heating & Cooling From the 1940's through the 70's, most furnaces were de- signed to just heat the house, cooling was the exception. Therefore, all furnaces had belt drive motors and standing pilot lights. The net result was a super quiet air delivery system. But everything changed when the government started to mandate higher efficiency ratings. So in the 80's all the manufacturers switched to direct drive multiple speed blower motors, electronic ignition and inducer motors. This resulted in louder operating noises than on any of the "old" units. If the furnace was in a basement, crawl or attic then the noise level was tolerable but if the equip- ment was in the hallway or kitchen then it became an issue. After some time most people got used to the noise and lived with it. As we entered the 90's most manufacturers were busy with the newest technology, the 90% furnace. These units elim- inated the need for a conventional metal chimney because they could be sidewall vented with PVC piping. Also, they used a second PVC pipe to draw in combustion air from outside, which minimized the negative pressure within the home. The net result was a quieter furnace than the 80% units. The design evolution of furnaces continues, and today the pinnacle is 98% efficiency with modulating gas valve and variable speed blower. This is not only the most efficient and comfortable furnace but it is quieter than the old standing pilot light units. If you have any HVAC questions, call 800-350-HVAC (4822) or email adam@officialhvac.com FREE SPACE GARD AIR CLEANER WITH PURCHASE OF ANY NEW HIGH EFFICIENCY FURNACE Quantities are limited,. For your FREE estimate call Official today! ESALE OFFICIAL Heating & Cooling 800-350-HVAC (4822) officialhvac.com EACTORY ALTHORIZED DEALER NATE Carrier BBB 4 Time A Honoree Sunso the eperts Ask Adam" Adam has been in the HVAC industry for over 40 years. He has been involved in all aspects of the business from service to sales. His main interest is in customer comfort. How Have Furnaces Changed Over Time? Adam Kern, Owner Official Heating & Cooling From the 1940's through the 70's, most furnaces were de- signed to just heat the house, cooling was the exception. Therefore, all furnaces had belt drive motors and standing pilot lights. The net result was a super quiet air delivery system. But everything changed when the government started to mandate higher efficiency ratings. So in the 80's all the manufacturers switched to direct drive multiple speed blower motors, electronic ignition and inducer motors. This resulted in louder operating noises than on any of the "old" units. If the furnace was in a basement, crawl or attic then the noise level was tolerable but if the equip- ment was in the hallway or kitchen then it became an issue. After some time most people got used to the noise and lived with it. As we entered the 90's most manufacturers were busy with the newest technology, the 90% furnace. These units elim- inated the need for a conventional metal chimney because they could be sidewall vented with PVC piping. Also, they used a second PVC pipe to draw in combustion air from outside, which minimized the negative pressure within the home. The net result was a quieter furnace than the 80% units. The design evolution of furnaces continues, and today the pinnacle is 98% efficiency with modulating gas valve and variable speed blower. This is not only the most efficient and comfortable furnace but it is quieter than the old standing pilot light units. If you have any HVAC questions, call 800-350-HVAC (4822) or email adam@officialhvac.com FREE SPACE GARD AIR CLEANER WITH PURCHASE OF ANY NEW HIGH EFFICIENCY FURNACE Quantities are limited,. For your FREE estimate call Official today! ESALE OFFICIAL Heating & Cooling 800-350-HVAC (4822) officialhvac.com EACTORY ALTHORIZED DEALER NATE Carrier BBB 4 Time A Honoree Sunso the eperts