It's hard to give the furnace filter 5 stars. I have no idea if it really works the way the manufacturer claims it does. My house is getting as dusty as it was before installing the Carrier Infinity air filtration system. Before I got it, however, I changed the oven filter every 3 months, each costing about $15. That's $60 a year. This filter costs about $20 more per year, but only needs to be changed once a year. Tip: stick a piece of masking tape on the outside of the filter box and write down the date of the filter change. Oh, and one more thing, my Carrier oven turns on once a day around 1pm and turns on the fan for a maximum of about 10 seconds to check airflow. When I realized this was happening I called the company that sold and installed it. They had no idea what was going on until they called Carrier. My Carrier Thermostat will sometimes show a message saying it's time to change the filter, but this is based on time (WTF) rather than an airflow test. One more thing, Carrier has no customer support. This is very bad.
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