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Trusted HVAC Services in Littleton, CO
Sentry Heating & Cooling has been serving the Denver Metro area with comprehensive HVAC solutions since our founding. Our team of seasoned technicians specializes in furnace, boiler, and AC system installation, repair, and maintenance, combining decades of collective experience with state-of-the-art equipment to deliver reliable service. We prioritize customer satisfaction through transparent pricing, ENERGY STAR-certified products that reduce energy costs by up to 30%, and a commitment to never leaving a job incomplete. Our 24/7 emergency services ensure immediate response to critical heating and cooling needs, while our focus on direct manufacturer partnerships allows us to pass savings to clients without compromising quality.

With a 50-mile service radius from Littleton, CO, we serve residential and commercial clients with personalized attention, offering digital thermostat upgrades, radiant heating systems, and hot water heater solutions tailored to individual requirements. Our reputation for honesty is reflected in testimonials highlighting fair pricing, expert diagnostics, and proactive maintenance that extends system longevity. We guarantee satisfaction through rigorous quality checks and a no-hidden-charges policy, ensuring every project meets exact specifications. Our veteran-owned operation brings military-grade precision to HVAC services, emphasizing integrity and technical excellence in every interaction.
Services
Furnace Installation Boiler Repair AC Maintenance Radiant Heating Hot Water Heaters Digital Thermostats
Highlights and features
  • We offer 24/7 emergency HVAC services for urgent needs
  • Our technicians have decades of combined HVAC experience
  • We install ENERGY STAR systems saving up to 30% on energy costs
  • We guarantee satisfaction with no hidden charges policy
  • We serve a 50-mile radius from Littleton, CO
What people say
Extremely fair Honest and reliable Saved us $2000 Resolved quickly No additional charge
Services
Furnace Installation
We specialize in complete furnace installation for residential and commercial properties. Our certified technicians handle all brands and models, ensuring proper sizing and efficiency. ENERGY STAR-rated systems reduce energy costs by up to 30% while maintaining optimal comfort. Our process includes system evaluation, professional installation, and certification for safety and performance.
Boiler Repair
Our boiler experts provide comprehensive repair and maintenance for residential and commercial systems. We diagnose issues with pressure, leaks, and efficiency, offering both emergency and scheduled service. Our technicians service all brands and perform cleaning, certification, and component replacement to restore optimal functionality and extend equipment lifespan.
AC Maintenance
Professional AC maintenance ensures peak performance and longevity. Our technicians clean coils, check refrigerant levels, and inspect electrical components. Annual maintenance improves efficiency, reduces energy costs, and prevents unexpected breakdowns during peak cooling seasons for central, evaporative, and split systems.
Radiant Heating
We install in-floor radiant heating systems and heat pumps for efficient, even temperature distribution. Radiant systems provide comfortable warmth through flooring while heat pumps offer dual heating/cooling capabilities. Our experts design systems tailored to home size and insulation requirements for maximum energy efficiency.
Hot Water Heaters
Our team installs and repairs traditional and tankless hot water heaters. We assess household needs to recommend energy-efficient models that reduce operating costs. Services include tank replacement, leak repair, and anode rod maintenance to ensure reliable hot water supply and prevent premature system failure.
Questions
Do you offer 24/7 emergency HVAC service?
Yes, we provide 24/7 emergency HVAC services for urgent heating and cooling needs across our service area.
What areas do you service?
We serve the Denver Metro area and surrounding regions within a 50-mile radius of Littleton, CO.
Are your technicians certified?
All our technicians are experienced professionals with specialized HVAC training and field expertise.
Do you offer free estimates?
Yes, we provide free estimates for all installation and major repair services upon request.
What payment methods do you accept?
We accept major credit cards and cash payments for your convenience.
Why choose Sentry Heating & Cooling?
We combine military-grade precision with decades of HVAC experience, offering transparent pricing and ENERGY STAR solutions that save up to 30% on energy costs.