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  2. Air conditioning - Wikipedia

    en.wikipedia.org/wiki/Air_conditioning

    Buildings designed with passive air conditioning are generally less expensive to construct and maintain than buildings with conventional HVAC systems with lower energy demands. [112] While tens of air changes per hour, and cooling of tens of degrees, can be achieved with passive methods, site-specific microclimate must be taken into account ...

  3. 12 Most Expensive Home Repairs (and How to Prevent Them) - AOL

    www.aol.com/12-most-expensive-home-repairs...

    HVAC. A new HVAC system can be an important home investment. But you’ll have to fork out a whole lot of money to pay for it. A new HVAC can cost between $5,000 and $12,000.

  4. Fan coil unit - Wikipedia

    en.wikipedia.org/wiki/Fan_coil_unit

    These motors are sometimes called DC motors, sometimes EC motors and occasionally DC/EC motors. DC stands for direct current and EC stands for electronically commutated.. DC motors allow the speed of the fans within a fan coil unit to be controlled by means of a 0-10 Volt input control signal to the motor/s, the transformers and speed switches associated with AC fan coils are not required.

  5. Heat pump - Wikipedia

    en.wikipedia.org/wiki/Heat_pump

    In most settings, heat pumps will reduce CO 2 emissions compared to heating systems powered by fossil fuels. [62] In regions accounting for 70% of world energy consumption, the emissions savings of heat pumps compared with a high-efficiency gas boiler are on average above 45% and reach 80% in countries with cleaner electricity mixes. [5]

  6. Heating, ventilation, and air conditioning - Wikipedia

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

    Most modern hot water boiler heating systems have a circulator, which is a pump, to move hot water through the distribution system (as opposed to older gravity-fed systems). The heat can be transferred to the surrounding air using radiators , hot water coils (hydro-air), or other heat exchangers.

  7. Vapor-compression refrigeration - Wikipedia

    en.wikipedia.org/wiki/Vapor-compression...

    A representative pressure–volume diagram for a refrigeration cycle. Vapour-compression refrigeration or vapor-compression refrigeration system (VCRS), [1] in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for air conditioning of buildings and automobiles.

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