Visit our HEATING AND AIR CONDITIONING page for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles. Will closing doors reduce my heating and cooling costs?.What are the most common problems with wall/window air conditioners?.Why is my air conditioner not cooling enough?.Why does it take so long to cool a house when an air conditioner has been off for a while?.Why has the thermostat screen gone blank?.What is wrong with an air conditioner when the air flow out of the vents is low?.How did homes stay cool in Florida before air conditioning?.Does an old air conditioner use more electricity as it ages?.The industry average service design life for most forced air furnaces is 15-20 years, and the industry average service design life for most air conditioning condensing units is 10-15 years. Where is the air filter for my central air conditioner and furnace? I can’t find it? How to determine the date of production/manufacture or age of Comfort-Aire® brand HVAC Systems.
How can I tell whether the condenser (outdoor unit) is an air conditioner or heat pump?.How can I find out the age of my air conditioner or furnace?.How can I find out the size of my air conditioner?.How can I find out the SEER of my air conditioner?.To learn more about heating and air conditioning systems, see these other blog posts: To determine the size in tons of a Nortek system, see our blog post How can I tell the age of a Nortek heat pump, air conditioner, or furnace from the serial number? For the age of another brand or manufacturer, go to our blog post How do I determine the age of my air conditioner? So the serial number shown below on the data plate of a Nortek package heat pump indicates that it was manufactured in 2017. Week of manufacture can be determined by using the 4 th & 5 th positions of the serial number. The fourth and fifth characters in the serial number are the year of manufacture for a Nortek system. Year of manufacture can be determined by using the 2 nd & 3 rd positions of the serial number. But there is one exception: if the third digit is not a letter, then the third and fourth digits are the. Nutone is produced by Nortek, formerly Nordyne. So the data plate shown below indicates the condenser was manufactured in 2009. Nortek is the new name of the company formerly known as Nordyne. The fourth and fifth digits of a NuTone serial number are the year of manufacture.