I have an older modern home which is not equipped with conventional air duct. This makes it genuinely difficult to heat in the Winter season. In the kitchen, we’ve installed a compact, natural gas heater. This furnace is a ventless, single-phase heater. Because it is ventless, it creates an oily movie on the windows in the kitchen. I have a pair of antique French doors which each have twelve small windows. These windows are time-consuming plus aggravating to clean. In the warm season, I rarely need to worry about them. During the Winter season, they are forever cloudy plus in need of a thorough scrubbing. Because the furnace is a single-phase unit, it blasts heat at maximum capacity component it achieves the temperature control setting. It then shuts down plus cools itself by blowing cool air. The constant on plus off cycling results in unpleasant temperature swings. The ventless furnace is also genuinely temperamental plus requires constant filter cleaning. At least once per week, I need to remove the two filters plus meticulously clean them. If there is any debris clogging the filters, the warning light on the component starts blinking red. When this happens, the furnace will no longer shutdown. It keeps running on maximum capacity, plus I worry that it might overheat. Overheating could destruction the furnace or even present a safety hazard. Once a year, the filter cleaning is not sufficient, plus I need to take the furnace apart plus clean it with high pressure air. The pressurized air removes any buildup of dust. Unfortunately, this dust then fills our kitchen. I should perform this task in the warm season, as a proactive strategy, when I can open the windows. Instead, I consistently wait until the furnace refuses to operate respectfully, in the middle of the Winter season.