My house is not airtight. I realized that along the baseboards the workers skimped a bit. They used insulation in the walls, & sort of loosely did it along the floor. Then the wood baseboards hid the shoddy workmanship. I can assume that they did a exhausting job though. The frosty air is right around our feet level & it is horrible. I always have to wear socks & occasionally slippers in the Winter season. If the issue was our door frame or windows leaking in air, the maintenance would be straight-forward. With the baseboards being the issue, I would have to do some major construction. I would need to tear out the baseboards, section of the wall & add in insulation. I entirely don’t want to do this. However, I guess I might need to. My heating bills are obnoxiously high. It makes sense though. The oil furnace is set to heat our lake house until it is around 81 degrees. When most of the heating is leaking out of the house & the frosty air is leaking in, it can’t achieve the temperature control temperature. The oil furnace then just keeps heating & heating. Not only is this bad for the energy bills, however I am worried that our oil furnace will overwork itself. The oil furnace could possibly overheat & quit. Major oil furnace parts can get worn out doing this. So maybe the job on the baseboards are not as bad as I guess they are. The expense of the maintenance vs the furnace bills should be comparable. Also, I will then have quality heating.