Since October 1996, Cool Sunshine Heating & Air Conditioning has repaired, replaced, installed, and maintained furnaces, air conditioners, heat pumps, ductless systems, and zone controls for Denver homeowners. Call 303-287-1846 or request service online to schedule a visit, and a technician will come to your home, check the system, and walk you through the options.
We are a family-owned and operated company serving homeowners across Denver. When the furnace quits on a January morning or the air conditioner gives out in a July heat wave, the first need is a clear next step.
Serving Denver Since 1996 | BBB Accredited, A+ Rating | 4.8 Stars from 200+ Google Reviews
Air Conditioning Repair, Service & Installation
When an air conditioner blows warm air, cycles on and off, leaks, or makes new noises, we diagnose the fault and explain whether repair or replacement is the better call. Cool Sunshine Heating & Air Conditioning provides air conditioning service and repair, installs new central air conditioning systems, and replaces aging units, sizing each system to the home it will cool.
If your Washington Park home has an air conditioner with a long repair history, ask for a side-by-side look at one more repair against a new system. We will go over the age of the equipment, what has failed before, and what the house needs from its cooling before you decide.
Furnace Repair & Installation
A furnace or gas heater that will not start, blows cold air, short cycles, or runs loudly needs a diagnosis before anyone recommends a new one. We repair, replace, and install gas furnaces, and we explain the fault in plain terms so you can weigh a repair against a replacement.
Renovating a Capitol Hill house? Bring us in before the walls close. Furnace location, venting, and duct routing are easier to settle while the framing is open, and we can price a repair and a replacement side by side.
Boiler Repair & Installation
A boiler heats a home by sending hot water through radiators, baseboard units, or in-floor radiant floors tubing, so trouble usually shows up as uneven heat, banging or gurgling noises, leaks, or no heat at all. We repair, replace, and install boilers, and we find the fault before recommending a repair or a new unit.
Radiators or baseboard heat in a Cheesman Park house are part of the system too, so ask us what a boiler swap would involve for the heating already in the walls and floors.
Heat Pump Installation & Repair
A heat pump heats and cools a home with one system, so the work spans installing a new unit, replacing an older one, and repairing or servicing equipment you already own. We look at the home’s current equipment and comfort complaints before recommending a heat pumps setup, and we service it after installation.
Sloan’s Lake homeowners with a heat pump that needs repair, or those comparing a heat pump with a furnace-and-AC pair, can ask us to lay out the options for their house. Winter performance depends on the equipment chosen and the home itself, which is why we review both before you commit.
Ductless Mini Split Installation & Repair
A ductless mini split (often called a ductless AC when it is used for cooling) heats and cools a single room or zone without ductwork, which suits additions, converted spaces, finished basements, and older homes or any house with no duct system. We size and install the indoor and outdoor units, repair mini splits already in place, and service them over the years. Whether it is a first install or a replacement, ductless systems let a room run on its own settings.
If your Highland home has a back-room addition, a finished attic, or a converted garage that never matched the rest of the house, a mini split can give that space its own temperature control without extending existing ducts.
HVAC Maintenance & Seasonal Tune-Ups
Routine maintenance is a scheduled inspection and cleaning of your heating and cooling equipment, done so small faults are found before they turn into breakdowns. We offer maintenance plans that put your furnace and air conditioner on a regular schedule, and many homeowners book a cooling visit before summer and a heating visit before winter.
A fall visit ahead of the first cold snap gives a Park Hill household time to deal with whatever turns up on the furnace while the weather is still mild.
Zone Control System Installation & Repair
A zone control system gives a home room-by-room temperature control, using motorized dampers and separate thermostats to send heating and cooling to different parts of the house so each area can follow its own schedule. We install zoning on existing duct systems, repair dampers and controls, and work zone control systems into replacement projects when the layout calls for it.
If your Congress Park home has a warm upstairs while the main floor stays comfortable, zoning is one of the fixes we will weigh against duct changes or a ductless unit, and we will say which one fits the house.
Indoor Air Quality Systems & Whole-Home Humidity
Indoor air quality work adds equipment to your heating and cooling system, such as upgraded filtration, air purification, ventilation, and whole-house humidifiers or dehumidifiers. We review what the home already has, then recommend indoor air quality equipment that works with the existing system.
Colorado’s dry climate puts humidity control on the table for some homes. In Green Valley Ranch or any other part of Denver, we start with the system you have and price add-ons one at a time, so you can pick the ones worth installing.
Why Denver Homeowners Choose Us
A heating or cooling decision lasts for years, so each visit starts with the equipment already in your home and ends with options you can compare. We explain what we find, show the repair and replacement paths side by side, and leave the decision with you.
Cool Sunshine is a family-owned and operated company. BBB lists Joy Valentine as President and General Manager and Perry Valentine as Owner and Manager, and the business has been BBB Accredited since 1999.
Our office is at 4395 Oneida Street in Denver, and our work reaches neighborhoods from Hilltop and Whittier to Berkeley, Central Park, and City Park.
Furnace, AC, and Heat Pump Questions Before You Call
Why is my air conditioner running but not cooling my Denver home?
A system that runs without cooling usually points to restricted airflow, a refrigerant or compressor problem, or an outdoor unit that cannot shed heat. Confirm the thermostat is set to cool and the air filter is clean, then look for ice on the indoor coil or refrigerant lines. If you see ice or the air stays warm, switch the system off and schedule a diagnostic visit so a technician can find the cause.
Why is the furnace in my Denver home blowing cold air?
Cold air from a furnace often traces to a thermostat fan setting left on, a clogged filter, or a part such as the ignitor or flame sensor that has stopped working. Check the thermostat and filter first. If both look fine, the fault is inside the furnace and needs a technician, because the repair depends on which component failed.
How do I decide between repairing and replacing a furnace before another Denver winter?
Weigh the furnace’s age, how often it has been repaired, whether comfort has slipped, and what the current repair would involve. A safety finding from a technician counts for more than any of those. We lay out the repair option and the replacement option side by side, so you can compare them before the cold arrives.
Will a heat pump keep my Denver home warm through the coldest weeks of winter?
That depends on the model, its sizing, the home’s insulation and ductwork, and whether a backup heat source is part of the plan. Some homeowners pair a heat pump with a gas furnace in a dual-fuel setup so the furnace covers the harshest days. We size the equipment to the house and explain how the system would run in winter before you commit.
Can I add air conditioning to an older Denver home with radiators or outdated ductwork?
Yes. A home with hot-water radiators or baseboard heat has no ducts to carry cool air, and outdated ductwork may not suit a central system as it stands, so the usual options are ductless mini splits or new or modified ductwork where space allows. We survey the house, tell you which approach fits the layout, and explain what the work involves.
Is zone control worth it for a two-story Denver home with a finished basement?
Zoning is worth considering when one thermostat cannot keep every level comfortable, such as a warm upstairs paired with a cool basement. It works through dampers in a duct system built to support it, and a duct fix or a ductless unit sometimes solves the same complaint. We look at the layout and recommend the approach that fits.
Schedule Heating and Cooling Service
Whether the furnace quit overnight, the air conditioner cannot keep up, or you are ready to replace a system, call 303-287-1846 or use request service online to set up a visit. Tell us what the system is doing, and we will arrange a time to look at it in person.
When Sergio and the team came to my house, they were very professional and kind. They worked all day on the heat pump install and did a fabulous job! My home is finally cool and comfortable.
I would not think twice about using Cool Sunshine. I look forward to them servicing my new heat pump in the future.
Tim”
We had a fantastic experience with Aldo, our service technician. After another company told us our furnace was beyond repair and needed to be replaced, Aldo came in, took a thorough look, and discovered the issue was simply a blown fuse. He replaced it quickly and had our furnace running in no time—saving us thousands of dollars.
What really stood out was Aldo’s professionalism and transparency. He took the time to explain everything clearly, walking us through what had gone wrong and how he fixed it. His honesty and attention to detail were incredibly reassuring. It’s rare to find someone so knowledgeable and genuinely committed to helping customers.
Highly recommend Aldo for anyone looking for trustworthy, top-notch service.
Matt”
Highly recommended without reservation.”