Air conditioners are sized to keep the house cool, not cool it after the house is too hot. Set the temperature in the morning when it is cooler and let the air conditioner cycle on and off to keep the temperature at the set point. If you open the windows at night after it is cooler outside than inside, don’t forget to close the windows in the morning and re-set the thermostat.
Turning the thermostat lower to 15c will not cool the house any faster than setting it at 21c. Using the furnace on heat or air conditioning without a filter or with a dirty filter can allow dirt to pass through the filter and plug the furnace secondary heat exchanger and or the air conditioning coil. This can cause and expensive repair bill.
The furnace fan needs to move a set amount of air per ton of air conditioning. Operating the furnace with a plugged filter will slow the air flow and can cause the coil to freeze up. Check the filter monthly and change when required.
Most furnace filters are rated in MERV (minimum efficiency reporting value). The most common residential filter is a 1” pleated MERV 6-10. This filter will allow proper air flow with most furnaces. If a higher MERV rating is needed that a 3” or 4” filter rack could be installed to maintain proper air flow. 1” pleated filters available in hardware stores rated in 1200 microns or above can cause air flow problems with most furnaces
If you need high filtration levels contact us to check air flow requirements for your system.
