Watertight Mechanical

Full‐Scale HVAC & Plumbing Construction Contracting Services

Watertight Mechanical delivers professional commercial and residential services with integrity and craftsmanship. Whether you need water heater replacements, gas piping, or a custom remodel, we’ve got you covered.

Comprehensive Mechanical Services

Providing expert plumbing, HVAC, and gas piping solutions for homes and businesses with quality, reliability, and integrity.

Plumbing Services

New Construction & Remodels Only

We provide expert plumbing installations for new builds and tenant improvements, ensuring efficiency, compliance, and long-lasting results.

Plumbing Services Include:


New Construction Plumbing – Complete plumbing system installations for commercial & residential properties.

Tenant Improvements & Remodels – Plumbing modifications, fixture installations, and upgrades for renovation projects.


Gas Piping & Medical Gas Certification – Safe and code-compliant gas line installations for homes, businesses, and medical facilities.


Partnerships with Contractors – We work with trusted general contractors and builders to ensure seamless project execution.

HVAC Services

Service, Maintenance & Replacements Only

We specialize in HVAC system maintenance, repairs, and replacements for commercial property managers, business owners, and homeowners. Our team ensures your heating and cooling systems remain efficient, reliable, and cost-effective.

HVAC Services Include:

• Preventative Maintenance – Regular tune-ups, filter changes, duct cleaning, and inspections.


• HVAC Repairs – Diagnosing and fixing furnaces, AC units, heat pumps, ventilation systems, and refrigerant leaks.

• HVAC System Replacements – Upgrading inefficient units with high-performance, energy-efficient systems.


• Energy Efficiency Upgrades – Smart thermostats, zoning systems, and improved ductwork for better air circulation.


📌 Note: We do not provide HVAC installations for new construction.

Need Reliable HVAC or Plumbing Services?

About Watertight Mechanical

Expert HVAC & Plumbing Solutions Backed by Experience & Integrity

At Watertight Mechanical, we specialize in HVAC service, maintenance, and replacements, as well as plumbing for new construction and remodel projects. Founded in 2017 by Jeremy Paxman as a plumbing contracting business, the company expanded in 2021 when Craig Hereau joined, bringing over 20 years of HVAC service expertise. Together, they built a company dedicated to quality craftsmanship, reliable service, and customer satisfaction.

Why Choose Watertight Mechanical?

Expert HVAC & Plumbing Services with Integrity & Guaranteed Quality

With over a decade of experience, Watertight Mechanical specializes in HVAC service, maintenance, and replacements for commercial properties, homeowners, and property managers. We also provide plumbing solutions for new construction and remodels, ensuring quality, compliance, and efficiency. Our team is committed to honest work, fair pricing, and superior customer service.

  • 20+ Years of Combined Experience – Industry expertise in HVAC & plumbing.

  • Specialized HVAC Services– Repairs, replacements & preventative maintenance.

  • Trusted Plumbing Contractors – New construction & remodel expertise.

  • Licensed & Certified – Gas piping, medical gas, and code-compliant solutions.

  • Locally Owned & Operated – Serving The Treasure Valley with honesty & reliability.

Why Choose Watertight Mechanical?

Reliable Service, Trusted Craftsmanship, and Guaranteed Quality

With over a decade of experience, Watertight Mechanical delivers expert plumbing, HVAC, and gas piping services with a commitment to quality, honesty, and customer satisfaction.

  • 13+ Years of Experience – Proven expertise in residential and commercial projects.

  • Quality & Integrity First – Honest work, fair pricing, and reliable service.

  • 1-Year Warranty Service Contracts – Peace of mind with quality-backed warranties.

  • Comprehensive Services – Plumbing, HVAC, and gas piping solutions for any project.

  • Local & Trusted – Proudly serving the Treasure Valley and beyond

Frequently Asked Questions

 Do you offer plumbing repair and maintenance services?

We provide high-quality plumbing solutions that exceed industry standards. We focus on efficiency, reliability, and precision, ensuring that every project is completed seamlessly, supporting the success and sustainability of our clients’ businesses.

What types of HVAC services do you provide?

We offer high-quality residential and commercial services. For emergency situations, we provide 24/7 availability. From residential installations ensuring home comfort across seasons, to prompt repairs addressing the urgency of a malfunctioning AC, we prioritize your safety and comfort.

Do you provide gas piping services?

Yes! We offer gas piping installations for homes and businesses, including connections for BBQs, fire pits, furnaces, and appliances. We are also medical gas certified, ensuring safe and compliant installations for healthcare and specialized facilities.

What areas do you serve?

We proudly serve Boise, Meridian, Nampa, Caldwell, Emmett, and the entire Treasure Valley region, providing HVAC service and plumbing solutions for commercial and residential projects.

Contact us if you have more questions in mind

Our Clients Speak for Us

We take pride in making our clients happy. Read some of the feedback from satisfied homeowners who trusted Plumbster for their plumbing needs.

☆☆☆☆☆

"They are always professional, honest, efficient, and responsive. Highly recommend."

Intermountain Pet Hospital

☆☆☆☆☆

"Just had 3 new toilets installed by Jeremy. Great job, fast and very friendly service. He is the best"

Myrna Barnes

☆☆☆☆☆

"I strongly recommend Watertight Mechanical & Contracting, who has consistently impressed me with their plumbing skills and work ethics during our time working together.

Hill Construction

Ready to Get Started?

Whether you need plumbing, HVAC, or gas piping services, our team is here to help with trusted craftsmanship and quality service.

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