My house is close to two hundred years old, and there are a lot of drawbacks. Most of the windows are painted shut and they all leak air. Nothing in the house is level, square or plumb, and every system is outdated. We’ve gradually been upgrading the plumbing and wiring to improve safety, efficiency and reliability. Most of the rooms in the house only have a single electrical outlet, the water pipes are corroded, and there are no overhead lights. We also have insufficient insulation in the walls and ceilings and no duct system. Trying to heat and cool our giant, old house is nearly impossible. While we hope to someday invest in some type of whole home HVAC system, we are currently getting by with fans, portable air conditioners and ventless gas heaters. The ventless heaters are fairly effective but not super energy efficient. They also require a great deal of maintenance. I am constantly cleaning the filters to keep the heaters operating properly. Even a minor accumulation of dust causes the red warning light to blink, and then the heater 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 replace the old with new. Instead, I’m forced to wash metal screens in warm water, scrub away the dust and then dry them. Sometimes, this isn’t sufficient and I then need to take the heater apart to clean the inner workings. This requires a blast of air to dislodge the dust from components. The dust then spreads throughout the room, and everything needs to be cleaned.