Sealed combustion also doesn't allow deadly carbon monoxide to escape from the combustion chamber into the house when you turn on an exhaust fan or clothes dryer. A natural gas boiler, which pumps hot water into radiators or through floor pipes, is both a comfortable and energy efficient heating system. Hydronic systems are usually zoned to supply heat where and when you need it. They are also cleaner than forced air furnaces since they don't blow air and dust around the house. The unit brings in fresh outdoor air and exhausts stale indoor air.
Heat is extracted from indoor air and transferred to the fresh air stream.
This increases comfort in winter while improving indoor air quality. Air movement in summer reduces the need for air conditioning. In this climate comfort can be provided at a much lower cost through evaporative cooling that uses humidity to provide a cooling effect. It is the sensation of getting out of a pool on a hot summer day and feeling chilled for a moment until the water evaporates off the body. A ceiling fan uses airflow to provide comfort.