Oconomowoc is famous for its beautiful lakes – like Lac La Belle and Fowler Lake – but the area’s weather can swing from humid summers around 82.4°F to icy winters around 10.2°F. Whether your home is near South Cross Street near Downtown Oconomowoc or close to Highway 16, Pat’s Heating & Air Conditioning is here to keep you comfortable in every season.
We’ve spent over 36 years serving Southeastern Wisconsin, and we know exactly how to handle the region’s temperature extremes – from installing brand-new units to providing late-night emergency repairs.
Why Choose Pat’s Heating & Air Conditioning in Oconomowoc?
Oconomowoc is a growing city in Waukesha County, but one thing hasn’t changed: residents want fast, dependable HVAC solutions. That’s precisely what Pat’s delivers:
- Leading Expertise: With decades of hands-on experience, our technicians know the ins and outs of HVAC systems.
- Quick Call-Outs: Whether you’re by Woodlands or down near Briarwood, we arrive promptly to solve your problems.
- 24-Hour Care: We’re ready to tackle emergency issues any time – rain or shine, day or night.
- Customer Satisfaction Guarantee: We prioritize your happiness and always strive for top-notch service.
- Flexible Payment Options: We offer payment plans to make sure our services fit your budget.
Oconomowoc Air Conditioning Installation, Repair & Maintenance
Summer days in Oconomowoc can be especially hot, and temperatures sometimes climb above 82°F! When that happens, a reliable Air Conditioning Installation keeps your home cool and fresh – great for when you want to get back to a nice cool house after being out by Fowler Lake.
Got an existing AC unit? Our repair and maintenance services are available around the clock. We’ll make sure your system runs efficiently so you can relax indoors after a stroll along the Lake Country Trail.
Reliable Ductless HVAC Solutions in Oconomowoc
For homeowners who’d rather skip extensive ductwork, Ductless HVAC Installations deliver zoned heating and cooling exactly where you need it.
Our technicians can install sleek wall-mounted units in any room, so we don’t take up too much floor space and can cut down on your energy usage. Whether you live in a cozy historic house near Main Street or a modern condo near Pabst Farms, ductless systems are a versatile choice.
VRF Systems for Your Oconomowoc Home
Variable Refrigerant Flow (VRF) systems are an increasingly popular choice around Oconomowoc’s suburban neighborhoods. They switch from heating to cooling without skipping a beat – perfect for Wisconsin’s erratic weather patterns!
Pat’s expert team will evaluate your home’s layout and recommend the best VRF solution so you can always enjoy a balanced indoor climate.
Comprehensive Heating Solutions Across Oconomowoc
When winter comes knocking, temperatures can dip below freezing, especially if you’re out by Okauchee Lake or near the outskirts of Waukesha County.
Pat’s is your all-in-one provider for heating services in Oconomowoc, whether you need an urgent repair or a full system overhaul.
24/7 Heating Repairs
If your boiler starts acting up after a day of ice skating on Fowler Lake, don’t stress – our factory-trained pros are just a phone call away. We’ll be there to troubleshoot the issue and make honest recommendations to keep your heating costs manageable.
Boiler & Radiant Heating Installation & Maintenance
A quality boiler or radiant heating system can help you handle those frigid Wisconsin nights. Whether you’re considering an upgrade or just need routine service, we install new units that suit your property and follow up with regular maintenance to keep your system in great shape.
Heat Pump Services
A heat pump offers an all-in-one solution for:
- Heating and Cooling
- Cutting Down on Energy Bills
- Providing Reliable Comfort
Pat’s will help you select and install the right heat pump for your home – perfect for tackling Oconomowoc’s humidity during the summer and warming your space when the snow piles up in winter.
Hybrid Heating Technology
Need a bit more power when the thermometer dives? Our Hybrid Heating Service combines a heat pump with a furnace, guaranteeing a cozy home even on those bitterly cold nights near Rosenow Creek or Lake Drive. It’s an efficient, cost-effective way to keep your family comfortable!
Superior Air Purification Solutions
Indoor air can hide the following pollutants that aggravate allergies:
- Pollen
- Dust
- Other Particulates
Pat’s offers Air Purification Solutions to help clear the air, which is a relief for families living near the city’s bustling center or by the scenic waterfront. We install top-grade filters, as well as humidifiers and dehumidifiers, to help maintain optimum moisture levels all year long.
State-of-the-Art Temperature Control in Oconomowoc
Take charge of your home’s climate with our modern smart thermostats. You’ll be able to monitor and adjust temperatures from anywhere – especially handy if you’ve just spent the day shopping around downtown Oconomowoc and want to return to a perfectly set home environment. Plus, zoning control gives you the power to regulate different rooms individually, saving you energy and costs.
Commercial Services for Local Oconomowoc Businesses
Pat’s also supports the many enterprises around Oconomowoc – whether you’re located near Lake Drive or around Wisconsin Avenue. Our Commercial HVAC Services cover everything from new installations to maintenance on existing systems, helping keep your workspace productive and comfortable for employees and customers alike.
Trusted Electrical Services in Oconomowoc
HVAC isn’t our only specialty. We provide a range of Electrical Services for homes and businesses across Oconomowoc:
- Circuit Breaker Installation
- Electrical Panel Upgrades
- EV Chargers
- Fans & Fixtures
- Smoke and Carbon Monoxide Detectors
- Generator Services
Contact Pat’s Team Today!
Got a furnace emergency near Lake Drive? Need an AC tune-up by the Oconomowoc River? Pat’s Heating & Air Conditioning is standing by. Call 262-208-5829 or fill out our online form, and we’ll get back to you promptly. Experience the same expert service that thousands of satisfied customers in Oconomowoc already trust!
We offer the following services (and more!) in Oconomowoc, WI:
Pat’s Heating & Air Conditioning has completed 20 jobs in Oconomowoc, WI in September 2026. The most recent job was on September 24, 2026.Recent Jobs and Reviews in Oconomowoc, WI
Oconomowoc, WI at a glance
Job Locations and Reviews
Installed dedicated electrical circuit for new hot tub installation in preparation for equipment delivery. Ran appropriate gauge wiring from main electrical panel through basement ceiling joists to exterior location, mounted disconnect box, and completed all connections per manufacturer specifications and local electrical code requirements.
Responded to service call for leaking Burnham indirect-fired water heater connected to boiler system. Upon inspection, confirmed active leak at water heater unit and identified additional plumbing components requiring attention, including deteriorated piping connections and compromised valve assemblies beneath ceiling-mounted infrastructure. Documented equipment conditions through photography, noting moisture damage to surrounding areas and age-related deterioration of brass fittings and gate valves. Prepared comprehensive quote for water heater replacement and necessary ancillary repairs to restore system integrity.
Completed installation of new air conditioning system and evaporator coil. System was tested and verified operational with proper refrigerant pressures and airflow confirmed throughout the ductwork.
Replaced anode rod on A.O. Smith ProLine XE water heater. Removed old corroded anode rod and installed new replacement rod from inventory to restore corrosion protection and extend tank life. Verified proper installation and system operation upon completion.
Responded to no-heat emergency call and performed comprehensive furnace tune-up and maintenance service. Diagnosed faulty pressure switch as cause of heating system failure; unit had temporarily resumed operation but pressure switch replacement was completed as preventive measure to ensure reliable operation. Conducted complete seasonal maintenance including inspection of blower motor assembly, electrical connections, and all system components. Verified proper wire routing and connections throughout control system, inspected capacitor and mounting hardware, and confirmed all safety controls functioning correctly. Unit returned to full operational status and found to be in good overall condition following service completion.
Responded to service call for two HVAC systems requiring inspection and repair. Diagnosed and replaced failed dual capacitor on pool house air conditioning unit, restoring cooling functionality. Identified gas supply issue on pool house furnace requiring licensed plumber for proper gas line connection. Performed system diagnostics and pressure testing to verify AC unit operational status after capacitor replacement.
Completed electrical installation for wall-mounted garage heater unit, including circuit wiring, disconnect switch installation, and proper grounding per code requirements. Verified unit operation and ensured all electrical connections were secure and properly terminated. Installation included mounting electrical components and testing system functionality upon completion.
Responded to air conditioning unit freezing issue over multiple service visits. System was found to be low on R-410A refrigerant, causing evaporator coil to freeze. Used manifold gauge set to diagnose refrigerant pressures and confirmed undercharge condition. Added R-410A refrigerant to bring system to proper operating levels. Observed dirty evaporator coil with visible contamination and dust accumulation, which may have contributed to restricted airflow and freezing condition. System restored to operational status following refrigerant charge correction.
Installed complete 4-zone HVAC system including Honeywell HZ432 zoning control panel, multiple aluminum blade bottom mount dampers (8x10, 8x12, and 8x14), transformers, and Ecobee Smart programmable thermostats with add-a-wire kits to restore heating and cooling functionality. Configured zone control for living room, bedroom, master bedroom, and office areas with motorized dampers integrated into existing ductwork plenum system. System tested and operational upon completion.
Renewed CCC Quality Plan with annual 10% discount on parts and filters. Performed comprehensive air conditioning clean and check on outdoor condenser unit, including inspection of all components, coils, and operational systems. System evaluated and found to be in good working condition with no issues identified.
Completed installation of new air conditioning unit and evaporator coil at vacant second-floor condominium unit. Uncased and installed "A" width coil in furnace closet, reused existing line set, and connected system to Square D QO panel with 20-amp circuit. Verified all control board wiring connections, closed all windows, and left system operational at 75 degrees upon completion.
Completed prepaid boiler tuneup and maintenance inspection. Verified pressure gauge readings within normal operating range, inspected internal components including blower assembly, heat exchanger, and all electrical connections. Checked gas line connections, venting system, and all plumbing connections for proper operation. All systems operating as designed with no issues identified. Unit is functioning properly and ready for continued service.
Successfully completed installation of EL297V 97% AFUE two-stage variable speed upflow furnace with 70,000 BTU capacity in basement location. Integrated Ecobee smart thermostat for enhanced climate control and energy management. Installed AA 700 bypass-style humidifier unit with cylindrical water reservoir mounted directly to supply ductwork with proper electrical connections and water supply lines. Addressed existing 4-inch B-vent chimney configuration by removing obsolete vent fitting in basement to accommodate new high-efficiency condensing furnace venting requirements. All ductwork connections secured with proper strapping and supports to ceiling joists. System tested and operational upon completion with all components functioning within manufacturer specifications.
Responded to basement bathroom ventilation issue where existing Broan bathroom fan/heater unit required replacement. Removed old bath fan assembly from ceiling mount and installed customer-supplied replacement unit. Completed electrical connections, secured new fan/heater housing to existing junction box, and verified proper operation of both ventilation and heating functions.
Responded to no heat call at multi-unit residential facility with Mitsubishi VRF system displaying error code 5112 on AE-200 control panel affecting multiple rooms. Diagnosed faulty TH12 thermistor sensor in branch controller unit causing intermittent heating operation where units would initially blow warm air then shut down. Replaced defective temperature sensor, cleared error codes from system, and verified proper heating operation across all affected zones including rooms 8a, 8b, 9, 10, 11, 12, 14, 15, and 16 with PKFY-P12NHMU-E2 indoor units. System restored to full heating functionality.
Completed full HVAC system replacement for 2,800 square foot residential property with 4-zone configuration. Removed existing furnace, air conditioning unit, and evaporator coil, then installed new Lennox furnace with variable speed blower, outdoor condensing unit, and matching evaporator coil. Replaced zone control board with SLP-compatible model to maintain functionality across all four zones. Installed new 20-foot refrigerant line set with proper insulation and vacuum procedures. Replaced all 2-inch PVC condensate drain piping, running approximately 20 feet per drain line to ensure proper drainage and code compliance.
Electrical work included installation of new Cutler Hammer/Eaton service panel with dedicated 60-amp circuit for air conditioning unit and 15-amp circuit for furnace, with appropriate disconnect switches and proper conduit routing along exterior siding. Reused existing return air drop and media air cleaner cabinet to integrate with new system. Removed bypass humidifi
Installed new 4" chimney liner system for water heater venting, including B-vent cap, 3" to 4" reducer, and necessary pipe sections with elbow fittings. Properly secured all ductwork connections through ceiling joists using galvanized metal flange and ensured proper ventilation pathway from water heater to exterior termination point.
Relocated existing EV charger to right side of room and modified existing 3/4" conduit system by cutting and lowering the pipe run. Installed wood backing plate for secure mounting of customer-supplied Tesla wall charger. Extended conduit approximately 35 feet from existing junction box on left side of room to new charger location, running along wall and baseboard. Completed installation with proper mounting, electrical connections, and conduit terminations for fully operational Tesla charging station.
Completed comprehensive tune-up service on four HVAC units including two furnaces and two air conditioning systems, along with whole-home dehumidifier and humidifier maintenance. Replaced air filters throughout the system: two 20x25x4 filters and two 16x25x1 filters. Performed thorough inspections of all internal components including blower assemblies, burner mechanisms, gas valves, control boards, electrical connections, and ductwork connections. All units tested and confirmed to be operating properly and ready for their respective heating and cooling seasons.
Successfully removed and disposed of existing garage furnace unit. Gas line was properly capped off in accordance with safety codes to ensure secure disconnection from the fuel supply. Work area left clear and ready for future installation or alternative use.
