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Whats a MERV?
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Whats a MERV?

In the HVAC world, A MERV is the Minimum Efficiency Reporting Value. But what does it actually mean? A MERV rating relates to the filter in your heating & air conditioning system and its efficacy in air quality control. MERV ratings are on a scale of 1-20, and the higher the number means the fewer the contaminants that can pass through the filter. The MERV scale was designed by the American Society of Heating, and Air Conditioning Engineers (ASHRAE) to represent filter’s performance at removing or blocking particles from .3 to 10 microns in size.

A micron (or micrometer) is a unit of measurement approximately one millionth of a meter. To give perspective, wool fibers are considered to be usable for garments and carpets at 25 microns. So yeah, .03-10 is pretty small!

So what does that mean for you?  If you have a air conditioning & heating system in San Diego, the filter is incredibly important in removing particles such as pollen, dust mites, carpet fibers, mold spores, dust, pet dander, bacteria and airborne contaminants. Residential systems will typically remove these airborne contaminants with a MERV rated filter 7-12. MERV ratings of 13 and higher are usually found in hospitals, surgical settings and in even higher ratings clean rooms.

download (1)At Bill Howe heating & air conditioning, all standard filters installed have a MERV rating of 8. We also advise homeowners to regularly clean air ducts to remove impurities from the air and perform a maintenance on their heating and air conditioning system annually (twice a year if you have A/C and heat) in San Diego.

Heating & air conditioning tune-ups include changing out old filters and will extend the life of your HVAC system. To schedule your pre-season heating tune-up in San Diego, call 1-800 Bill Howe (245-5469) today! You’ll be glad you did!



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What David says about us

Service for new garbage disposal. My ancient garbage disposal quit working, went online to get Bill Howe’s number, immediately received and accepted chat to describe my needs. Prompt call back to schedule an appointment, service tech Allen was out same morning, which was important to fit my work schedule. Job estimate was clear, work done fully to my expectations, area left clean, and price was very fair.
I was not surprised — I have used Bill Howe plumbers for several other tasks in the past. I have always found their staff to be helpful, attentive, and the plumbers very courteous and capable.

January 2020


What Michelle says about us

I have been using Bill Howe since the late 1980’s, their service has always been excellent, plumbing, heating and restoration. I am most impressed by the integrity of their employees, not only do they know their work/skill, they do not waste time, they are so efficient, they are so helpful and they are a true “service”!

February 2020


What Mira says about us

Bill Howe never fails us! We had a drain overflow, and Scott came (on a Saturday) to look at it and offer solution. He was punctual, professional, and extremely helpful. I should also praise the main office for always being helpful and always finding solutions. Very grateful to have you in San Diego!

February 2020

Restoration & Flood

What Ed Gohlich says about us

Cory was our technician on this job. We had a time sensitive repair issue and Bill Howe understood and assisted with getting the job done quickly.
Cory was on time to start the job and finished it quickly. Upon his leaving our home he’s was courteous, very knowledgeable, explaining what the problem was and how he fixed it. Very good communication and this is the way it’s has always been when we use Bill Howe plumbing.
Great company to work with.
Thanks Cory.

August 2019

Heating & Cooling

What Eric says about us

I had a shower that would not drain. The employee arrived on time and fixed the problem quickly and effectively at a very fair price. I was very happy with everything. Thank you and I highly recommend your plumbing service.

January 2019


What Bridgett says about us

I am extremely happy with the service we received from Bill Howe Plumbing. We were given an incorrect diagnosis of our main sewer line from another vendor, but Bill Howe’s servicemen came out for a second opinion, correctly diagnosed our problem and resolved our back up issues. We will continue to use Bill Howe for all our future plumbing needs!

Thank you Bill Howe Plumbing.

July 2019