FURNACE FILTERS

I moved back to Kenosha, WI early December. Couldn't stay with my sister, mix up there. So where do I go? Tenants in my house commented on how they were behind on the rent, whole 'nother story there. Bear with me. Anyway, I commented I had to scramble to find a place to stay, and the empty bedroom was offered, I DID NOT ASK. What the heck, I took it. So, it being very cold, I am in the basement next to the furnace and can hear this thing going. Well, after the third day I get the idea of checking the filter. WOW, darn thing was plugged with dust...... I could swear furnace breathed a sigh of relief when I pulled filter while it was running. Major, and I mean MAJOR, difference! Rooms in basement are much warmer, and furnace is no where near working as hard. It's very discouraging that it seems that these people don't appear to care about the house, but they are only renting anyway. I start a new job Tuesday, and the lease is done February, so I only have to deal with it for two and a half months then I take house back, plus I am in the house to make sure they don't mess it up more. Thanks for staying until the end. But check filters, DON'T FORGET TO CHANGE!