As an Heating & Air Conditioning contractor & heating & cooling expert, I have had our tolerable share of people who were honestly undeserving their heating & cooling system. I understand that most people don’t have the expansive knowledge that comes with studying a subject in school for many years & then pursuing a job in that same field. What I am saying, though, is that there are certain expectations of understanding (especially with something as respected as a central air conditioning & central gas furnace). Let me get straight to the point. I am amazed by the number of buyers I’m sent to, from the Heating & Air Conditioning provider that employs me, who have not kept up with increasing their air filters and/or gas furnace filters. Let me be clear: I’m not judging you if you go 2 or 3 weeks instead of 1 month separate from increasing out the air filter or gas furnace filter. I’ll even disclose there have been numerous occasions in which I have neglected to officially change out our air filter. I’m talking about the folks who never change their air filter or gas furnace filter. Especially when those same people call their Heating & Air Conditioning provider complaining about their home’s air quality. Especially in the middle of a global pandemic I would suppose that people would at least consider increasing out a year-old air filter! I suppose that this problem over air filters might not seem relevant to you, necessarily, but you should suppose that the HVAC duct of your house is where the majority of your home’s viruses live. The air filters are the gateways to the HVAC duct & if not consistently changed out, you’re asking for awful air quality & to get sick. Please keep that in mind, especially now.