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  2. 10 Signs Your Heater Isn’t Working as Well as It Could (and ...

    www.aol.com/lifestyle/10-signs-heater-isn-t...

    The air filter for a furnace system should be replaced about once every 90 days, otherwise, the trapped hair, dirt, and other debris can clog the filter, reducing airflow and restricting the ...

  3. Heater core - Wikipedia

    en.wikipedia.org/wiki/Heater_core

    Clogging of the piping may occur if the coolant system is not flushed or if the coolant is not changed regularly. If clogging occurs the heater core will not work properly. If coolant flow is restricted, heating capacity will be reduced or even lost altogether if the heater core becomes blocked. Control valves may also clog or get stuck.

  4. HVAC control system - Wikipedia

    en.wikipedia.org/wiki/HVAC_control_system

    HVAC (Heating, Ventilation and Air Conditioning) equipment needs a control system to regulate the operation of a heating and/or air conditioning system. [1] Usually a sensing device is used to compare the actual state (e.g. temperature) with a target state. Then the control system draws a conclusion what action has to be taken (e.g. start the ...

  5. Duct leakage testing - Wikipedia

    en.wikipedia.org/wiki/Duct_leakage_testing

    A pressure 5 Pa or above indicates that the duct work is connected to or leaking to the outside. A smaller pressure difference indicates greater leakage. This method does not quantify duct leakage, but serves to identify locations of ductwork runs that are leaking to the outside. It is more of a qualitative measure, used for fault isolation.

  6. Is your heater making you sick? How to avoid cold-like ...

    www.aol.com/lifestyle/heater-making-sick-avoid...

    May says the best way to prevent microbial growth is to have a clean central air system and use a pleated media filter with a MERV (Minimum Efficiency Reporting Values) rating of 11. The rating ...

  7. Coolant - Wikipedia

    en.wikipedia.org/wiki/Coolant

    A coolant is a substance, typically liquid, that is used to reduce or regulate the temperature of a system. An ideal coolant has high thermal capacity, low viscosity, is low-cost, non-toxic, chemically inert and neither causes nor promotes corrosion of the cooling system. Some applications also require the coolant to be an electrical insulator.

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