Business Details
38 Years
experience
Emergency
services
Your Trusted HVAC Experts in Chattanooga, TN
Founded in 1988, St. Johns Heating & Air has built a reputation for excellence in HVAC services through decades of dedicated expertise. Our owner, Larry St. John, began his career as a technician and progressed through every facet of the industry before establishing our company. We prioritize customer satisfaction through rigorous technician training, maintaining a 1% hiring standard for specialists, and implementing a comprehensive 100% satisfaction guarantee. Our commitment to quality is demonstrated through meticulous installation practices, same-day service capabilities, and a proprietary maintenance program designed to maximize system longevity. We operate with core values of integrity and transparency, including upfront pricing, property protection protocols, and extensive background checks for all employees.Our technical capabilities span all HVAC system types, supported by a fully stocked fleet and NATE-certified professionals. We distinguish ourselves through unique guarantees like our one-year test drive for new systems and price-match assurance. Our team's collective experience, spanning over 30 years in the field, ensures we deliver solutions that balance technical precision with personalized service. We maintain industry leadership through continuous training on emerging technologies and adherence to the highest professional standards. Our operational philosophy centers on eliminating customer risk through comprehensive warranties and a commitment to resolving issues permanently.
Services
Repairs
New Units
Clean Air Solutions
Maintenance
Thermostat Installation
Humidifier Services
Air Purification
Ductless Systems
Package Units
Financing Options
Details
- Year established: 1988
Highlights and features
- 30+ years of HVAC experience with owner-led quality control
- NATE-certified specialists selected through rigorous 1% hiring standard
- 100% satisfaction guarantee on all repairs and installations
- 0% interest financing options available for new systems
- 24/7 emergency service with 30-minute arrival alerts
Associations and certifications
- NATE Certified Technicians
Services
HVAC Repairs
Our NATE-certified technicians diagnose and fix all HVAC issues with same-day service. We stock 80% of common parts and provide upfront pricing. Repairs come with a 1-year warranty and our 100% satisfaction guarantee.
New Unit Installation
We install complete heating and cooling systems with customized solutions for your home. Includes Manual J Load calculations, 0% interest financing options, and our 1-year test drive guarantee on new installations.
Maintenance Programs
Our maintenance plans include seasonal system checkups, priority service scheduling, and discounts on repairs. Designed to extend equipment life and maintain manufacturer warranties through regular professional servicing.
Air Quality Solutions
We offer whole-home air purification systems, UV lights, humidifiers, and smart thermostats. Our solutions address allergens, humidity control, and ventilation needs for healthier indoor environments.
Emergency Services
Available 24 hours a day, 7 days a week for urgent HVAC issues. Our emergency technicians carry essential parts and provide immediate diagnostics with transparent pricing before any work begins.
People
Larry St. John
Owner
With over 30 years in the HVAC industry, Larry St. John founded the company after working in all aspects of heating and cooling systems. He established our rigorous quality standards and customer-first philosophy that guides our operations today.
Questions
What HVAC services do you offer?
We provide complete HVAC solutions including repairs, installations, maintenance, air purification systems, thermostat upgrades, and emergency services for all residential heating and cooling systems.
Do you service all brands of HVAC equipment?
Yes, our technicians are trained to service all makes and models including gas, electric, heat pumps, ductless systems, and package units.
What financing options are available?
We offer 0% interest financing and multiple payment plans for new HVAC system installations to qualified customers.
What guarantees do you provide?
We back all repairs with a 1-year warranty and offer a unique 1-year test drive guarantee on new system installations.
Are your technicians certified?
All our specialists are NATE-certified, with only 1% of applicants meeting our strict hiring standards.
How quickly can you respond to emergencies?
Our 24/7 emergency service provides same-day appointments with 30-minute arrival alerts via text or call.
Reviews (3)
Tammy Pearson
Jun 21, 2018
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They are awesome. They helped us fix our unit while they were visiting in Ohio. Had us up and running in no time. They are greatly appreciated. Thank.
Rita Haskew
Sep 18, 2017
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Chattanooga and surrounding areas are Absolutely Blessed with this company. From Larry, Ryan, Derek, Rebecca and all employees.their integrity, .
Gina Brock Tramel
Aug 15, 2017
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I recommend St. John's to anyone needing repair or a new HVAC system. They set the bar high with customer service, workmanship and knowledge of their.
