My loft is close to multiple hundred years old, and there are a lot of disadvantages.  Most of the windows are painted shut and they all leak air. Nothing in the loft is level, square or plumb, and every idea is ancient.  We’ve gradually been upgrading the plumbing and wiring to improve safety, efficiency and reliability. Most of the rooms in the loft only have a single electrical outlet, the water pipes are corroded, and there are no overhead lights.  The people I was with and I also have insufficient insulation in the walls and ceilings and no duct system. Trying to heat and cool our giant, old loft is nearly impossible. While the people I was with and I hope to someday invest in some type of whole lake loft HVAC system, the people I was with and I are currently getting by with fans, portable cooling systems and ventless gas heaters.  The ventless gas furnaces are fairly effective but not super energy efficient. They also require a good deal of maintenance. I am always cleaning the filters to keep the gas furnaces operating properly. Even a minor accumulation of dust causes the red warning light to blink, and then the gas furnace refuses to shutdown. It continues to blast at maximum capacity non stop, and I worry about overheating and safety risks.  However, cleaning the filters is aggravating. I wish the filters were disposable so that I could simply update the old with new. Instead, I’m forced to scrub metal screens in hot water, scrub away the dust and then dry them. Occasionally, this isn’t sufficient and I then need to take the gas furnace apart to scrub the inner now workings. This requires a blast of air to dischalet the dust from components. The dust then spreads throughout the room, and everything needs to be cleaned.

HVAC contractor