In central air conditioning systems, the choice between boilers and furnaces depends on the specific needs of the system and the region's climate. However, it's important to note that boilers and furnaces serve different purposes in a central HVAC (Heating, Ventilation, and Air Conditioning) system.
Boilers: Boilers are primarily used for heating purposes and are commonly associated with radiant heating systems or hydronic heating. Boilers heat water, which is then circulated through pipes and radiators or delivered through in-floor heating systems. They do not directly contribute to air conditioning, as their main function is to provide warmth.
Furnaces: Furnaces, on the other hand, are designed specifically for central heating systems. They heat air and distribute it throughout the building using ductwork. Furnaces can work in conjunction with air conditioning systems by using the same ductwork to deliver cooled air during the summer months.
Efficiency: When it comes to efficiency, both boilers and furnaces have options that offer high energy efficiency. The efficiency of a boiler is typically measured by its Annual Fuel Utilization Efficiency (AFUE), which represents the percentage of fuel that is converted into usable heat. High-efficiency boilers can have AFUE ratings of 90% or more. Furnaces, on the other hand, are rated by their Annual Fuel Utilization Efficiency (AFUE) as well, indicating the percentage of fuel that is converted into heat. High-efficiency gas furnaces can have AFUE ratings above 95%.
In terms of cooling efficiency, the efficiency of an air conditioning system is determined by the SEER (Seasonal Energy Efficiency Ratio) rating. The SEER rating applies to the air conditioning component of the central HVAC system and is independent of the heating source (boiler or furnace). Therefore, the efficiency of the air conditioning system itself is not directly impacted by the choice between boilers and furnaces.
Ultimately, the decision to use a boiler or a furnace in a central air conditioning system depends on the heating requirements and the existing infrastructure in the building. It is advisable to consult with an HVAC professional to assess your specific needs and recommend the most suitable and efficient system for your situation.