Delivering great service to our New Hampshire neighbors since 1987
Founded in 1987 by Mark Downing, Granite State Mechanical Services has provided professional installation and service of heating, cooling, and plumbing products for New Hampshire’s homeowners and businesses for over 30 years. Throughout the course of 3 decades, we’ve learned a lot and still to this day continue to innovate to always make sure we are arriving at a customer’s home as the experts in HVAC and plumbing.
...and continuing strong
Now entering 35+ years of serving our New Hampshire homeowners and local businesses, Mark's two sons Zak & Jack are fully involved as the second generation. You can find Zak running the business as well as visiting customers to look at projects. Jack is our Service Manager, leading our team of technicians in repairing and maintaining the advanced systems used to heat and cool NH homes. Together they lead a bright future for GSMS.
When you need service or repairs on your home's heating, cooling, or plumbing system we are ready to serve you. From the moment you call our office to when our truck is backing out of your drive, your experience with GSMS will be exceptional. We strive to train and educate our Specialists so they have the knowledge and experience to properly provide you with service.
The GSMS Story
Watch: Zak Downing shares the history of GSMS and our commitment to the families we serve.
Hands-On Since Day One
Our story didn't start in a boardroom; it started under a boiler with a flashlight. Zak didn't just 'ride along' with his father, Mark—he was out there working. From the age of five, Zak was holding the light, observing every repair, and learning the trade through pure hands-on experience.
That foundation led to years of Zak installing new systems and working closely with our manufacturers to master the latest technology. As the referrals grew, so did the team. Zak transitioned to focusing on growth for one simple reason: he never wanted to turn a neighbor away. Whenever Zak is asked about his goal, it's always the same: 'When that phone rings and it’s a referral, I want to be able to say, "Yes, we can take care of you. Welcome to the GSMS family."
Today, as we move into a new 'second-gen era,' our clients shouldn't notice a change. Zak has been part of every step of GSMS’s development, and the same values Mark instilled in him are the ones Zak instills in our team every single day." Mark, the man who started it all in 1987, is still a vital part of the GSMS team today. While he has transitioned the company to the second generation, he remains a Specialist in the field, visiting clients daily and ensuring the foundational values he built the company on are present on every call.
The "Specialist" Difference
At GSMS, we don’t have 'technicians.' We have Specialists. Because of Zak’s lifetime in the field, he knows that a Specialist doesn't just fix a problem—they take ownership of the system. They ensure every install is perfectly level, every shut-off is tagged for safety, and every client is treated like family. When you see the Red Square on our uniform, you’re looking at the highest standard in the industry.
The Independent Alternative
You’ve probably noticed a change in our industry lately. Large out-of-state corporations and private equity firms are buying up local shops and turning them into high-pressure sales machines. GSMS is different. We are 100% family-owned and locally operated. We answer to our neighbors, not a board of directors. Our focus is on long-term relationships, not short-term quotas.
GSMS is our DNA
- We challenge ourselves to find positivity - it’s easy to be negative
- We create a vision for tomorrow by recognizing yesterday’s work
- It isn’t a failure as long as we learn from it
- We visualize the good in our lives without ignoring the bad
- This is a daily habit for us
- No one takes better care of our clients than we do
- We have clients, not customers - customers are transactions, clients are relationships
- Our solutions are never based on sales
- We build integrity through honesty
- We always do what is right, even when it can be challenging
- If an issue arises, we solve it promptly
- The details we consider the smallest, have the greatest impact
- Everything we do is with a future mindset for serving our clients
- What seems like our daily can be someone’s once-in-a-lifetime
- Take a minute out of your day to make someone else’s day
- We don’t half-ass anything
- Everything we do individually affects our team
- No one takes better care of their people than we do
- Communication is everything
- Our vendors are part of our team and we treat them like it
- We grow each other by sharing our knowledge
- No gossip or speaking poorly, we are professionals
- Open door policy about everything
