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?.Where is the air filter for my central air conditioner and furnace? I can’t find it?.How can I tell whether the condenser (outdoor unit) is an air conditioner or heat pump? The International trade fair for heating, ventilation, air conditioning, measuring, regulation, sanitary and environmental technology.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: ![]() There are two letters in the beginning of the seial number in some models, but the first number is still indicative of the year of manufacture.įor the age of another brand or manufacturer, go to our blog post How do I determine the age of my air conditioner? A/C Products” equipment made by First Co., that circulate the hot water from a gas or oil-fired water heater to the air handler for heating a home. This serial number system is used for both the “AquaTherm" and "U.S. B = 2018Īnd the sequence continues, with F= 2022, G = 2023 etc. The first letter of the serial number denotes the year of manufacture, based on the listing below.
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