Looking for a little advice regarding my forced air oil furnace. Just bought the house and trying to ensure all is taken care of prior to heating season!
1 - At one point in the history of the furnace, an oil company tech suspected that there may be a small crack in the heat exchanger. Suggested new furnace. Another tech came out and cleared the same unit twice on two different occasions. Said he thought the unit was OK and that he can not visibly see any cracks. Thus, he cleared the unit. Should I pay for an HVAC company's opinion or just go with the oil company's opinion and carbon monoxide detectors in house as a backup should there be any issues?
2. - The house is approx. 2,200 or so square feet and has 2-3 returns. 2 were confirmed, one was very weak if it is at all. Two returns that are supposed to come up through the floor are stuffed in the basement and no cut out is present in the floor. The furnace is pulling a lot of air right outside the unit where the filter is, which I assume because it can't get enough through the returns. My concern is the air its pulling from the basement. The basement is damp and moldy. Recently repainted, some moldy materials taken out but a lot of dirt crawl spaces and such in the basement. I don't want the unit to take the moldy air from the basement and circulate through the house. Would you address this by adding more returns, using a super-high quality filter, and a UV light add-on or some combination there of?