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 That's abt the time when things might start going wrong! 
 😬 mine is nearing 40 and rocking like a champ! However, fresh ventilation and a carbon monoxide are a definite must! 
 Dang that's impressive 
 It is, but “they don’t make em like they used to” right? It’s an old high efficiency model and it works great in Mid-American winters. Being that I worked for an HVAC in high school, I service my condenser, air handler and furnace every year just to make sure drains are clear, dog hair/leaves/etc are clean off the fins and all wiring is good. Saved myself 10k in replacing it by replacing the motherboard. 💪