Jefferson HVAC Contractor
Local Heating, Ventilation & Air Conditioning Solutions
Carew Heating & AC provides professional HVAC services in Jefferson, WI for homes and businesses throughout Jefferson County. As a licensed HVAC contractor with insured technicians, we handle furnace repair, air conditioning service, HVAC installation, air duct cleaning and routine maintenance. Since 1996, Jefferson families have relied on our residential HVAC contractors for honest recommendations and heating and cooling solutions built for efficiency, performance and long term reliability.
Serving Jefferson From Our Watertown Location
1104 S 10th St, Watertown, WI 5309424-Hour Emergency
Service Available
24-Hour Emergency HVAC Repair in Jefferson
Call (920) 557-0543 for emergency HVAC repair in Jefferson. We provide 24/7 emergency heating and emergency AC services for residential and commercial properties in Jefferson. When your heat goes out in January, our emergency furnace repair technicians work to restore warmth before temperatures inside your home drop too far. When your air conditioner quits on a humid July afternoon, our emergency AC repair team responds to get cooling back on fast. We also provide around the clock boiler repair and heat pump service to prevent further system damage.
*Our emergency HVAC service covers system failures, not life-threatening situations. Call 911 first for fires, gas leaks, or injury risk.
HVAC Repair, Replacement & Installation Services in Jefferson
Our Jefferson HVAC contractors provide complete heating and cooling services designed to keep your property comfortable in every season. From quick repairs and preventative maintenance to a complete HVAC installation, Carew Heating & AC delivers professional workmanship backed by decades of industry experience. We service furnaces, boilers, air conditioners, ductless mini splits and heat pump systems throughout Jefferson and surrounding communities.
Heating Services
Cold Wisconsin winters require reliable heating equipment for consistent indoor comfort. Our Jefferson heating services focus on safe operation, efficient performance and dependable warmth throughout the heating season.
- Furnace Replacement: Install modern high efficiency furnace systems designed to deliver reliable heating and improved energy performance.
- Furnace Repair: Fast furnace repair for ignition problems, airflow restrictions, thermostat issues, blower failures and complete system breakdowns.
- Furnace Maintenance: Preventative furnace tune ups to clean components, inspect safety controls and optimize efficiency.
- Heater Replacement: Professional installation of heating systems properly sized for dependable indoor comfort.
- Heater Repair: Troubleshoot electrical faults, mechanical problems and uneven heating performance.
- Heater Maintenance: Routine service designed to extend equipment lifespan and maintain heating reliability.
- Boiler Replacement: Upgrade aging boiler systems with modern hydronic heating equipment for consistent warmth.
- Boiler Repair: Resolve leaks, pressure problems and circulation issues affecting boiler performance.
- Boiler Maintenance: Scheduled service to keep boiler systems operating efficiently and reliably.
- Oil Furnace Maintenance: Specialized maintenance service for oil furnace systems to maintain safe and efficient heating.
Air Conditioning Services
Warm summer weather in Wisconsin makes dependable cooling essential. Our Jefferson air conditioning service helps AC systems hold steady indoor temperatures while running as efficiently as possible.
- AC Repair: Diagnose refrigerant leaks, compressor problems, electrical faults and airflow issues affecting cooling performance.
- Air Conditioning Replacement: When repairs no longer make sense, we replace outdated units with efficient central air systems sized correctly for your home.
- AC Maintenance: Seasonal AC tune ups to inspect components, clean coils and improve system performance.
- Mini Split Installation: Ductless systems installed for zoned heating and cooling in additions, finished basements, garages and older homes without ductwork.
- Heat Pumps: Installation, repair and maintenance for heat pump systems.
- Thermostats: Install programmable and smart thermostats for improved temperature control and energy efficiency
Ventilation & Air Quality Services
Indoor comfort also depends on healthy air and balanced ventilation. Our Jefferson HVAC team provides airflow improvements and air quality solutions designed to support cleaner indoor environments.
- Air Duct Cleaning: Remove dust, debris and contaminants throughout the duct system, not just at the registers, to improve airflow and indoor air quality.
- Air Purification Services: Whole home air purifiers and filtration upgrades that capture pollen, smoke, pet dander and fine dust.
- Dryer Vent Cleaning Service: Remove lint buildup along the entire exhaust path so your dryer vents properly and dries clothes faster.
- Ductwork Services: Repair, sealing and installation of duct systems designed to improve HVAC efficiency.
- High Efficiency Filters: Advanced filtration systems capture airborne particles, dust and allergens.
- HVAC Zoning: Zoned HVAC systems allow independent temperature control in different areas of your home.
- Humidifiers: Whole home humidifier systems help maintain balanced humidity during dry winter months.
- Dehumidifiers: Systems designed to reduce excess indoor moisture and improve comfort.
- Radon Mitigation: Radon reduction systems designed to improve indoor air safety.
- Trane Products Installation: Professional installation of high efficiency Trane heating and cooling equipment.
HVAC Financing in Jefferson, WI
Heating and cooling upgrades can be significant investments. Carew Heating & AC offers new HVAC system financing in Jefferson through Wells Fargo, making it easier to finance a heating and cooling system without draining your savings. Financing can cover furnace installation, air conditioning replacement, mini split installation and other HVAC improvements, helping homeowners restore comfort quickly while keeping payments manageable.
Reasons To Call a Jefferson HVAC Company
Heating and cooling equipment often shows warning signs before a complete failure occurs. If your system begins running differently, contacting a licensed HVAC contractor early for furnace repair or air conditioning service can help prevent costly breakdowns, improve efficiency and restore reliable comfort inside your home or business.
Heating Issues
- Furnace won’t ignite: Ignitor failure, gas valve problems or thermostat wiring issues may stop the system from starting.
- Furnace blowing lukewarm air: Dirty flame sensors, clogged filters or airflow restrictions may reduce heating output.
- Uneven heating between rooms: Duct leaks, blocked vents or blower motor problems may prevent proper heat distribution.
- Boiler making knocking noises: Mineral buildup or pressure imbalance inside the heat exchanger may affect circulation.
- Radiators not heating evenly: Air trapped in the system or circulation pump issues may limit hot water flow.
- Frequent furnace cycling: Overheating safety switches, thermostat calibration problems or restricted airflow may cause short cycling.
Cooling & AC Issues
- AC unit won’t start: Electrical disconnect problems, failed capacitors or thermostat faults may prevent startup.
- AC running but not cooling: Refrigerant leaks, dirty condenser coils or compressor issues may reduce cooling performance.
- Frozen evaporator coil: Airflow restrictions or refrigerant imbalance may cause ice buildup on the coil.
- AC system running constantly: Poor insulation, thermostat placement or system sizing problems may affect operation.
- Warm air from vents: Reversing valve issues or compressor problems may interrupt cooling cycles.
- Mini split not cooling properly: Sensor errors, clogged filters or refrigerant problems may affect ductless systems.
- AC making buzzing or rattling noises: Fan motor wear, loose parts or electrical issues may require service.
General HVAC Problems
- Poor airflow throughout the home: Dirty filters, blocked ductwork or failing blower motors may restrict circulation. Air duct cleaning often helps restore proper airflow.
- Indoor air quality concerns: Dust, allergens or airborne contaminants may circulate through the HVAC system.
- Sudden increase in energy bills: Aging equipment or duct leaks may reduce system efficiency.
- Humidity problems indoors: Ventilation issues or malfunctioning humidifiers or dehumidifiers may affect comfort.
- Thermostat not responding: Wiring problems, sensor errors or programming issues may interrupt system control.
- Strange odors from vents: Mold growth, dust buildup or overheating components may create unpleasant smells.
- Frequent HVAC breakdowns: Repeated service calls may indicate equipment nearing the end of its lifespan.
Do You Need a Permit to Replace an HVAC System in Jefferson?
Yes, you need a permit to replace an HVAC system in Jefferson. The City of Jefferson Building Inspection Department requires a permit for any additions, changes, repairs or alterations, including HVAC system replacement.
HVAC work done without approved permits can bring safety risks, legal penalties, insurance challenges or costly repairs down the road. Our team manages permits and installation for a safe system aligned with code requirements.
For permitting questions and correspondence, contact the City of Jefferson Building Inspection Department:
- 317 South Main St, Jefferson, WI 53549
- (920) 674-7727
The Best Residential HVAC System for Jefferson Homes
Choosing the right HVAC system for a Jefferson home depends on factors like home size, insulation quality and Wisconsin’s seasonal climate. Winters in Jefferson often bring temperatures between the mid teens and low 20s°F, while summer highs typically reach the upper 70s to low 80s°F with periods of humidity. Many homes in Jefferson average 1,800 to 2,100 square feet, making properly sized furnaces paired with central air conditioning, modern heat pumps or ductless mini splits a strong choice for year round comfort. A correctly matched system helps improve energy efficiency, stabilize indoor temperatures and extend equipment lifespan.
If you’re considering a new HVAC system, Carew Heating & AC can evaluate your current equipment, review your home’s heating and cooling needs and recommend the right solution for dependable comfort in Jefferson.
Climate Factors
Average in Jefferson, WI
HVAC Impact
Winter Low
14 – 22°F
Reliable heating systems, such as high-efficiency furnaces, support winter comfort
Summer High
78 – 83°F
Central air conditioning helps maintain steady indoor cooling
Average Home Size
~1,950 sq. ft.
Proper HVAC sizing improves airflow and overall system efficiency
Seasonal Humidity
Moderate to High
Whole-home dehumidifiers and enhanced filtration improve comfort and air quality
