If you own one of the many older homes in Carol Stream, IL, that date back to the 1980s, chances are your HVAC systems are ready for an upgrade. Newer DuPage County homes, too, need updated, reliable heating and cooling systems for the best in energy efficiency and comfort.
We offer a wide selection of top-quality Trane and Mitsubishi HVAC and indoor air quality products that will keep your home comfortable during the hot, humid summers. Our family-owned and -operated business can also provide you with a free estimate for a standby generator, so you never have to live without your heating system when a snowstorm takes down the local power grid.
Call Blue Frost Heating & Cooling today for a free estimate on a generator, heating system, air conditioner, or indoor air quality product.

Top-Rated Heating Services
Blue Frost services all types of heating systems, including heat pumps, furnaces, and boilers. Our NATE-certified technicians provide exceptional installation, heating repair, replacement, and maintenance services to keep your home nice and warm throughout the chilly winter.
- Heat pumps: These appliances provide energy-efficient heating and cooling for year-round comfort.
- Furnaces: We offer gas and electric furnaces with both standard and high efficiencies so that you can choose the right option for you.
- Boilers: A boiler provides comfortable radiant heating to keep you cozy all winter long.
Air Conditioners in Carol Stream
During humid Illinois summers, a home air conditioning system is an absolute must. Our highly trained technicians can assist you every step of the way, from initial installation to maintenance, repairs, and replacement. We service all brands of central air conditioners, heat pumps, and ductless mini-splits.
- Replacement and installation: Upgrade to a new system for improved reliability and energy efficiency.
- Emergency AC repair: When your AC fails, you can rely on us to respond day or night.
- AC maintenance plan: Our plan includes an annual air conditioning tune-up to prepare your cooling system for summer.
- Ductless mini-splits: Mini-splits are a highly efficient cooling option for homes without ducting or those that need customizable zoning.
Air Quality Services
Indoor air quality is important for your family’s health and comfort. We can help you choose between premium products for optimal indoor air.
- Air cleaners: Using mechanical HEPA filters, these devices can remove many unwanted airborne contaminants and greatly reduce your seasonal allergy symptoms.
- Humidifiers: When the dry winter causes itchy skin and dry eyes, use a whole-home humidifier to introduce much-needed moisture into the air.
- Dehumidifiers: Humid summers can make your home feel stuffy and uncomfortable, and can make your AC work harder.
- Ductwork services: We clean and repair leaky ductwork to prevent dust from circulating through your home environment.
- Air purifiers: These devices remove airborne contaminants like dust, pollen, bacteria, and viruses.
Generator Services
When the power grid goes out, a whole-home generator can be a godsend. From powering your HVAC system and keeping the lights on to ensuring your home security system is up, a generator is an invaluable tool. We offer general maintenance and tune-ups to keep your generator in tiptop condition.
Plumbing Services
We take pride in being a full-service company you can call for all your home service needs. We’re happy to install helpful plumbing appliances in your home.
- Sump pumps: Keep floodwater out with a reliable sump pump to protect your home and belongings.
- Water heater services: We can install, replace, repair, and service your hot water heater.
- Tankless water heaters: Get hot water on demand and enjoy lower utility bills with a tankless water heater.
Commercial Services in Carol Stream
Having a reliable commercial HVAC system for your facility is a no-brainer for keeping your employees and customers comfortable. We offer a suite of commercial HVAC services, including AC tune-up and heating service.
Choose Blue Frost HVAC for All Your Home Services
Blue Frost HVAC has served the community since 1973 and is known for our exceptional customer service and lifetime repair warranties. With us, you can expect full transparency, affordable pricing, and friendly service. We’re an Angi Super Service Award winner and a proud Chamber of Commerce member.
If you need HVAC, generator, plumbing, or indoor air quality services, call Blue Frost HVAC today.
Recent Jobs and Reviews in Carol Stream, IL
Job Locations and Reviews
Responded to installation callback to correct electrical breaker oversight on recent Trane 16 SEER AC upgrade (model 5TTR6030 with ADP upflow/downflow coil). Removed existing 30A 2-pole breaker and installed proper 25A 2-pole breaker per manufacturer specifications, completing the installation to code requirements.
Performed complimentary inspection of two sump pump systems and ejector pump in residential basement. Conducted visual assessment of primary sump pump installation, verifying proper PVC discharge piping configuration, check valve operation, and float switch functionality. Inspected secondary sump pump system for operational readiness and confirmed adequate basin depth and pump positioning. Examined vertical discharge piping secured with appropriate brackets and rubber couplings to accommodate vibration and thermal expansion. Evaluated ejector pump system and associated plumbing connections. All systems found to be in working order with no immediate concerns noted. Documentation photographs captured for maintenance records.
Completed comprehensive BFMA tune-up service on outdoor air conditioning condenser unit aged 4+ years. Performed standard maintenance protocol including inspection of cylindrical ribbed condenser housing, verification of unit operation, assessment of coil condition, and evaluation of overall system performance. Unit showed normal weathering consistent with outdoor exposure; all components found operational and system running within manufacturer specifications.
Responded to service call for commercial electric boiler issue with early morning availability requirements. Upon inspection, diagnosed and repaired malfunctioning boiler components, including evaluation of pressure relief valves, water supply lines, and electrical connections. System restored to proper operating condition and tested for safe operation.
Conducted sales estimate for commercial water filtration system installation in basement mechanical room. Assessed existing plumbing infrastructure including boiler connections, PVC distribution piping with brass fittings, and multiple vertical supply lines with red-handled ball valves for future filtration system integration.
Completed comprehensive BFMA air conditioning tune-up on 6-year-old residential system. Performed full preventive maintenance inspection including checking refrigerant levels, electrical connections, and condenser coil cleaning on outdoor unit. Inspected and documented heavily soiled air filter requiring replacement, ensuring optimal airflow and system efficiency for continued operation.
Completed installation of upgraded Trane 5TTR6030 16 SEER air conditioning system with matching ADP upflow/downflow evaporator coil. Removed and reinstalled existing downflow furnace to accommodate the new coil configuration, which required additional clearance due to increased coil height. System installed on exterior concrete pad, charged with refrigerant, tested for proper operation, and verified all connections secure.
Completed comprehensive air conditioning tune-up on 8+ year old system during afternoon service window. Upon inspection, found evaporator coil heavily clogged with dust, dirt, and debris accumulation, significantly restricting airflow and reducing system efficiency. Thoroughly cleaned coil fins to restore proper heat transfer capability. Inspected attic-mounted air handler unit, verified proper operation, and checked all accessible components including refrigerant lines and drainage system. Documented pre-service conditions showing substantial contamination on outdoor condenser coil with thick buildup obscuring metal fin structure. Performed standard maintenance protocol including filter inspection, electrical connection verification, and operational testing to ensure system running at optimal performance levels.
Completed semi-annual BFMA tune-up service on 22-year-old HVAC system, including full AC maintenance and filter replacement. Inspected and serviced outdoor evaporator coil unit, which showed normal wear and debris accumulation consistent with equipment age. Replaced heavily soiled accordion-style pleated air filter with new filter to restore proper airflow and system efficiency.
Completed comprehensive BFMA preventive maintenance tune-up on 9-year-old air conditioning system during scheduled afternoon appointment. Performed full system diagnostics including electrical testing with digital multimeter, recording voltage and amperage readings at condenser unit to verify proper compressor operation and electrical performance within manufacturer specifications. Inspected condenser coil condition, verified refrigerant pressures, and documented all measurements to ensure optimal system efficiency and reliability for continued operation.
Responded to no-cooling call on Lennox air conditioning unit displaying Error 31 code. Upon arrival, diagnosed complete system failure with neither compressor nor indoor blower fan operational. Performed electrical diagnostics on control board and tested circuit connections, identifying control board malfunction preventing system startup. Inspected ductwork and condensate drainage system for secondary issues related to extended non-operation period. Coordinated service timing with homeowner's return schedule and provided recommendations for system protection during the diagnostic process.
Conducted estimate on one-ton wall-mounted mini-split system in server room experiencing refrigerant loss. Inspected indoor unit and documented electrical panel configuration to assess system requirements and potential replacement options.
Performed comprehensive BFMA tune-up on 2+ year old air conditioning system. Upon arrival, found condenser coil heavily contaminated with dirt, dust, and organic debris accumulation affecting heat transfer efficiency. Completed full system inspection including cleaning of condenser coils, verification of refrigerant pressures, electrical connections inspection, and operational testing. Unit restored to proper working condition with improved airflow through coils and optimal performance parameters confirmed.
Performed scheduled maintenance tune-up on 25-year-old Generac generator unit. Upon inspection, discovered Generac Nexus Controller displaying "STOPPED - ALARM" status with "RPM Sense Loss" error code, indicating a critical sensor malfunction preventing normal operation. Documented controller condition and error status for further diagnostic evaluation and repair recommendations.
Performed comprehensive A/C tune-up service on outdoor condenser unit. Upon arrival, found unit heavily coated with accumulated dust, dirt, and fibrous debris throughout exterior surfaces and cooling fins. Completed thorough coil cleaning to remove significant buildup that was restricting airflow and reducing system efficiency. Cleaned condenser coils using appropriate methods to restore proper heat transfer capability. Removed vegetation growth around unit base and cleared debris from surrounding area to ensure adequate clearance and airflow. Unit operational following service with improved airflow through cleaned coil surfaces.
Completed comprehensive BFMA tune-up on residential air conditioning system aged 3+ years. Upon inspection, discovered significant frost and ice accumulation on evaporator coil and plenum assembly, indicating restricted airflow or potential refrigerant charge issues. Verified thermostat operation showing system set to 74°F in cooling mode with fan running continuously. Performed standard maintenance protocol including filter inspection, coil cleaning, refrigerant level assessment, and airflow evaluation to address freezing condition and restore proper system operation.
Completed comprehensive BFMA tune-up service on a 5-year-old Trane air conditioning system. Performed standard maintenance procedures including inspection of outdoor condenser unit, cleaning of condenser coils, verification of refrigerant levels, electrical connection testing, and system operational checks. Unit found to be in good working condition with no immediate repairs required; all components functioning within normal parameters.
Completed comprehensive BFMA tune-up on 6+ year old HVAC system as first call of the day. Performed electrical diagnostics on outdoor condensing unit using clamp meter, recording amperage readings of 30.75 amps to verify proper compressor operation and system performance. Inspected condenser coil, fan assembly, and all exterior components, confirming unit operational status with no visible defects or required repairs.
Completed comprehensive BFMA tune-up service on 18+ year old air conditioning system. Performed full system inspection, cleaned heavily soiled evaporator coil and condenser unit, removed accumulated debris and dirt buildup from outdoor unit grille and filter, checked all electrical connections, tested system operation, and verified proper airflow. Unit returned to optimal operating condition with improved efficiency.
Completed comprehensive BFMA tune-up on residential outdoor AC condenser unit aged 1+ years. Upon inspection, discovered heavily clogged filter with significant accumulation of dust, debris, and organic matter restricting airflow. Cleaned condenser coils, removed debris from unit top and surrounding area, serviced filter, and verified system operation. Unit restored to proper working condition with improved airflow efficiency.