Furnace & AC Service in Castle Rock, CO

June 12, 2025

If you’ve ever woken up to a freezing house in winter or suffered through a heatwave with a malfunctioning AC, you know the true value of a reliable HVAC system. Yet it’s tempting to handle minor HVAC issues yourself or hire the cheapest handyman available. But then it is also essential to understand that what seems like a quick fix today can turn into a major—and expensive—problem tomorrow. After all, your furnace and AC aren’t just any appliances, they’re your first line of defense when you’re seeking refuge from chilly winters or scorching sun. Thus, neglecting professional HVAC maintenance is the worst decision you could make.


When you hire a certified Furnace and AC technician in Castle Rock, you’re not just paying for a repair—you’re investing in a system that runs at maximum efficiency, saving you money on energy bills. These professionals don't cut corners that can lead to fires, leaks, or even carbon monoxide exposure, instead, they provide preventive maintenance that catches even the smallest issues before they become emergencies. 


We know that a poorly maintained system works harder, driving up energy bills while delivering subpar performance while clean filters and ducts mean healthier air for your family, reducing allergens and pollutants. Thus, at 303 Heating & Air, Inc we offer annual check-ups, urgent repair, and even a full system replacement so that your home stays comfortable and functional at all times. We also offer emergency services so call now to book your appointment and experience the difference our team of professionals make.

About - Castle Rock, CO

Incorporated in 1881, Castle Rock is a part of Douglas County, Colorado. The town has a population of more than 73,150 residents and has seven landmarks that are listed in the National Register of Historic Places. Among the various points of interest in the town are Miller Activity Complex, Rock Park, Theatre of Dreams, Bison Park, Wrangler Park, and more.

Happy Customers in Castle Rock, CO

We live in a rental home that was having multiple issues with carbon monoxide and gas. Tom did a fantastic job replacing our furnace and was extremely thorough and found additional issues that other technicians had overlooked. Highly recommended!!!

Ally H.

Had Tom replace our AC and furnace. He did an excellent job and was done in less than a day. He communicated very well and delivered exactly what he promised. We are extremely satisfied and recommend him without hesitation. Thank You from the Carltons

Stephanie C.

We had an excellent experience for our furnace installation with Tom. He was incredibly knowledgeable and professional. It is clear that he takes pride in his work. We would highly recommend him and his company!

Tim W.

Great service, Tom was on time and his estimate beat others by hundreds. I will be refereaing close friends and family! Thank you!

Danny

Tom was amazing. Honest, fast, and did the work with excellence. Great prices and a great guy. Call Tom before you have one of the "big guys" come and charge you way too much.

Gerry O.

Highly recommend! Tom installed a new furnace and water heater at my house. Fair prices, excellent service, efficient.

Rachel R.

Our Services in Castle Rock, CO

303 Heating & Air, Inc - Top Rated Furnace & AC Service in Castle Rock, CO

When it comes to keeping your home cozy in the winter and refreshingly cool in the summer, you deserve an HVAC system that is working at its top efficiency. That’s where 303 Heating & Air, Inc comes in. As Castle Rock’s top-rated furnace and AC service, we’ve built our reputation on honest work, unbeatable expertise, and genuine care for every home we service. With fair, transparent pricing for every repair, maintenance, or installation, we ensure that our customers do not have to endure any surprise charges.


If you’re not happy, we’re not happy. This is why we stand behind our work with a 100% satisfaction promise. From routine maintenance that keeps your system running smoothly to emergency repairs that save the day, our certified technicians have the skills to get the job done with zero delays. Call us today to schedule service and trust us that we'll answer your calls promptly, show up on time, and give you the perfect solution as per your budget.

HVAC technicians repairing an air conditioning unit, using tools; outdoors.
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Furnace with a new air filter being inserted, wires and circuit board visible inside.
September 9, 2025
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A hand holding a remote control aimed at a white wall-mounted air conditioner.
August 4, 2025
Cooling your house during hot summer months by installing a new air conditioning system is the best way to overcome the heat.