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2. Furnace (central heating) - Wikipedia

   en.wikipedia.org/wiki/Furnace_(central_heating)

   Furnaces are mostly used as a major component of a central heating system. Furnaces are permanently installed to provide heat to an interior space through intermediary fluid movement, which may be air, steam, or hot water. Heating appliances that use steam or hot water as the fluid are normally referred to as a residential steam boilers or ...

3. 25 projects every homeowner should do this winter - AOL

   www.aol.com/25-projects-every-homeowner-winter...

   Hire a top-rated professional to inspect your furnace, boiler and HVAC system. ... Start the winter season with a complete HVAC inspection and tackle any repairs and cleaning tasks that will keep ...

4. Duct (flow) - Wikipedia

   en.wikipedia.org/wiki/Duct_(flow)

   After cleaning, there is still left over visible dust floating around the house. After or during sleep, occupants experience headaches, nasal congestion, or other sinus problems. Rooms in the house have little or no air flow coming from the vents. Occupants are constantly getting sick or are experiencing more allergies than usual.

5. Heating, ventilation, and air conditioning - Wikipedia

   en.wikipedia.org/wiki/Heating,_ventilation,_and...

   Clean air delivery rate (CADR) is the amount of clean air an air cleaner provides to a room or space. When determining CADR, the amount of airflow in a space is taken into account. For example, an air cleaner with a flow rate of 30 cubic metres (1,000 cu ft) per minute and an efficiency of 50% has a CADR of 15 cubic metres (500 cu ft) per minute.

6. Spring cleaning - Wikipedia

   en.wikipedia.org/wiki/Spring_cleaning

   Spring cleaning is the practice of thoroughly cleaning a house in the springtime. The practice of spring cleaning is especially prevalent in climates with a cold winter . In many cultures, annual cleaning occurs at the end of the year, which may be in spring or winter, depending on the calendar.

7. Central heating - Wikipedia

   en.wikipedia.org/wiki/Central_heating

   This limit controller may shut the furnace off if the blower fails or if something is blocking the air flow. The heated air is then sent back through the home through supply ducts. In larger commercial applications, central heating is provided through an air handler which incorporates similar components as a furnace but on a larger scale.