Frequently Asked Questions

We answered some of your questions regarding cooling & heating systems repairs, installation, and more!
Why can't I find the correct size furnace filter at my local home improvement store?

The filter installed with your MM Comfort Systems furnace is larger and made from higher-quality materials than disposable filters found in retail stores. Filter replacement is automatically included as part of our Planned Maintenance Agreement – the most cost effective way to keep your system in efficient working condition. Replacement filters can also be purchased directly from MM Comfort Systems. We maintain an on hand inventory of the most common sizes. Call 425-881-7920 and ask for parts or email us.

Where can I get parts for my comfort equipment?

Your experts at MM Comfort Systems are the best resource for identifying and supplying the correct, current parts for your system, as well as pricing and availability.

Which comfort equipment will best fit my home?

There are many factors that affect the sizing and specifications of your system, including square footage, insulation, window surface and configuration, geographic location of your home, duct sizing and arrangement, and many others. Your MM Comfort Systems design consultant can perform an in-home load analysis to determine which equipment combinations will perfectly suit your home and your family’s needs.

What does my warranty cover?

MM Comfort Systems provides a full parts and labor defects warranty for one year from date of installation. Manufacturer equipment / parts warranties vary and are typically longer than one year. Carrier now offers an industry-leading twenty year warranty on secondary heat exchangers on their high efficiency furnaces. MM Comfort Systems will help to ensure you obtain maximum benefit from any applicable manufacturer warranty.

How much will a new system cost?

There is is very wide range of system sizes and capabilities.  On the lowest end, a small simple furnace replacement is about $3,000. On the higher end, a larger zoned Hybrid system (heat and a/c) with leading edge Indoor air Quality capabilities would be an investment of around $20,000. Your MM Comfort Systems Consultant will work with you to develop a system appropriate for your needs.

Why is the SEER rating on the Energy Guide different than what my dealer quoted?

Each split system cooling unit has a nominal SEER rating. This rating can be increased with the upgrade of the indoor unit. The SEER rating of a system is derived based on the combination of equipment installed in the home. The outdoor equipment (heat pump or air conditioner), as well as the indoor equipment (evaporator coil and furnace, or air handler), play a vital role in the rating. Please see your MM Comfort Systems representative for the information.

What is the life expectancy of my unit?

In the Pacific NW, properly maintained, furnaces, heat pumps, air conditioners and hot water heaters have normal useful lives of 10 – 15 years.

I am an Architect and need application/specification information so that I can specify Carrier products... where do I obtain this information?

MM Comfort Systems can provide you with the specifications, and can also set you up to access the Carrier HVACpartners web site so that you can access the information yourself. If you are seeking specifications on older equipment, so as to specify something similar, it will be helpful if you have the model and serial number available.

How do I program my thermostat?

If you know what type of thermostat you have, one of our service coordinators can send you the manufacturer’s instructions.  If you do not know what type of thermostat you have, we may schedule a service visit for a technician to assist you.

The inspector came but did not say anything, does he have to sign off my permit?

Sign offs for permit inspections are done electronically.  Should any items require correction, the inspector will inform you of that and then you will want to inform us immediately, so that we may address it.

Do I have to schedule my permits and do I have to be home?

Your installation coordinators will provide you with the information for scheduling the required inspections and what to expect.  You will need to be at home for the inspection visit.

What is the warranty on my furnace, odu and coil?

Our service coordinators can assist you in locating the model and serial number for your equipment and contacting the manufacturer to confirm the warranty information.

Get Expert Advice!

An MM comfort consultant can provide you a proper evaluation of your home’s heating and cooling needs. It is the best way to determine the ideal system for your home.

“The install was completed today and I have to say the guys were pretty amazing. Super friendly, cooperative, easy to ask questions and very thorough.“

Tom W.

April 16th, 2020

“Everyone that I interacted with was professional, informative and very helpful. They answered all my questions and addressed any concerns I had.I really appreciate how quick the whole process was.“

Terry R.

March 13th, 2020

“Brian who is the lead and Sam the apprentice did an excellent job. They know their work very well understand the systems and explained it to me so I can know what to do in the future. They’re very clean and tidy and we’re on time every day.“

Susan L.

March 2nd, 2020

“The installers were extremely professional, completed their work in a timely manner, were extremely efficient, cleaned up after themselves. I highly recommend MM to all my friends!“

Percy S.

August 2nd, 2019

“Evaluated several companies. MM had a top rated product at a good price. Install was seamless, system works superbly.“

Jerry L.

August 1st, 2019

“Install guys were on time and courteous. Worked hard and did a really good job with the entire install. Buttoned everything up nicely. Absolutely would use them again.“

D. Stewart

July 24th, 2019

“Stellar work and customer service.“

Mary K.

June 14th, 2019

“Chris & Russ did a great job installing AC in my townhome! They were professional, competent & attentive to detail. They reviewed the installation process, showed me how to change filters, explained product registration & warranties with me. I highly recommend MM Comfort Systems. You won’t be disappointed.“

Sandi G.

June 8th, 2019

“We had a truly great experience – New furnace, added AC and replaced a hot water tank. The process was smooth, the guys were awesome and the price affordable. NO COMPLAINTS. We would definitely recommend MM Comfort Systems.“

Bill H.

June 8th, 2019

“Awesome. Better the I could have ever expect. ALL techs have been amazing as well. When working it was like they were working on there own homes. That much care and effort to go above and beyond.“

Eric E.

May 24th, 2019

“The salesman Daniel was awesome! Didn’t feel pressured and gave me his honest opinion, super helpful and down to earth. The install crew was funny, friendly and helpful. Full install took about 7 hrs. Super stoked about all the money I will be saving and getting rid of our baseboard heaters!“

Jessica B.

May 11th, 2019

“(Derrick) you are like no salesperson we can recall. Your integrity is unmatched. We feel that you truly care about us.“

Ed J.

May 2nd, 2019

“I felt they were looking for the right solution and not pushing a particular product or giving a one size fits all answer.“

Radu D.

May 18th, 2019

“Drew from your company did an outstanding job of installing our new heat pump and the accompanying equipment in our little rental. We like the way they put booties over their boots when working in the house. Very respectful.“

Bob C.

January 18th, 2019

“Fantastic job all the way around. Incredibly professional, knowledgeable and skilled team. Would absolutely recommend MM Comfort to any friends and family.“


January 18th, 2018

“Installers did an outstanding job, It was obvious that they took pride in their work…. I wouldn’t hesitate to recommend MM Comfort Systems to others.“

Tom K.

January 14th, 2019

“We love the new system and were extremely pleased with the workmanship and professionalism of your entire team.“


November 1st, 2018

“Very friendly and honest“

Diane W.

October 18th, 2018

“The technician came on time and I got messages on his arrival. Even the company called me to make sure what I needed. They did not try to sell me anything and was patient to answer any queries I had.“


November 5, 2018

“My furnace went out on a weekend. Technician walked my through how to diagnose the problem over the phone, saving me a expensive weekend house call. They fixed the furnace the next week after ordering a part. Great service!“


April 11th, 2018

“Crew was professional, prompt, skilled, very happy we chose MM Comfort.“


March 31st, 2018

“Company gave us a time and date and were at the house promptly. The fellows working on the installation of the new a/c unit were polite and knowledgeable. They completed the job, cleaned up and said goodbye. We appreciated their thoughtfulness.“


February 31st, 2018

“The installation was on time and we were very impressed with the techs who were very efficient. We were very happy with the installation process.“


January 6th, 2018


Our Office

Office: M-F 8am - 5pm
Services: 24/7
9680 153rd Ave NE,
Redmond, WA 98052

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