At Favret Heating and Cooling, we get asked questions all the time. To make it more convenient for you, we’ve collected previous questions along with our expert responses.
1.) Are registers blocked?
2.) Are air vents (dampers) closed?
3.) Are the air ducts leaky or not insulated?
4.) Are the air ducts dirty?
5.) Is the HVAC system appropriately sized?
6.) Could a zoned HVAC system work better in your home?
A Favert professional can work with you to diagnose the problem and find a workable solution to meet your needs and budget.
Choose a filter that is just the right amount of filtering for your home, determined by its MERV rating (minimum efficiency reporting value). A clogged filter can prevent proper airflow in your HVAC system, causing the equipment to wear out prematurely.
In general, this is how often changing furnace filters needs to be done:
For 1- to 2-inch filters, replace them every 1 to 3 months
For 3- to 4-inch filters, replace them every 6 to 9 months
For 5- to 6-inch filters, replace them every 9 to 12 months
While the air filter is meant to control the amount of unwanted air particles entering your home, the MERV rating (Minimum Efficiency Reporting Value) is intended to help you determine which filter is the best fit for your home. The higher the MERV rating, the fewer particles and other contaminants pass through the filter.
While the highest MERV ratings are the most effective for air quality, they can also harm your HVAC system.
Airflow is vital for the performance and longevity of your furnace. Airflow is also the key to a comfortable home. A higher MERV rating means a higher resistance, which means less airflow.
If the MERV rating on your furnace is too high, it may force your furnace to work too hard and leave it vulnerable to damages. In addition, you may not get the air velocity required to reach all parts of your home, leaving inconsistencies in temperature.
A MERV rating of 13-16 is considered hospital-level air quality, so it is unlikely your home needs any more than that. According to the United States Environmental Protection Agency, filters from the 7-13 range often have minor differences from the higher MERV ratings. Still, they will allow your system to run much more efficiently.
What MERV rating you choose between 7 and 13 depends on what level of filtration you require. If your family has allergies or asthma, a higher MERV rating will be good for you. If your family doesn’t suffer from any breathing difficulties, a lower filter like a 7 will save you some money on your energy bill.