When you need reliable HVAC services, AC repair, or furnace repair in Cincinnati, trust the experienced team at National Heating and Air Conditioning. As an HVAC company with over 90 years of history serving the community, we’ve built a reputation for dependable service and unmatched expertise. Hundreds of Cincinnati homeowners and businesses rely on us for their heating and cooling needs, and we’re committed to earning your trust, too. Whether it’s keeping your AC running smoothly in the summer or ensuring your furnace is ready for winter, National Heating and Air Conditioning is here to help.
Don’t put up with an inefficient home any longer. Call National for professional heating and air conditioning services in Cincinnati, OH!
Heating Services in Cincinnati
Proper care of your heating system ensures it takes care of you when you need it most. As your trusted heating contractor, we specialize in services like furnace repair, furnace installation, and heat pump repairs to keep your home warm and comfortable. Regular maintenance, such as annual tune-ups, is essential for safety, efficiency, and longevity — especially for systems like electric furnaces.
A tune-up not only ensures your furnace operates safely by detecting potential carbon monoxide leaks but also helps prevent unexpected breakdowns during the colder months. By addressing minor issues early, you can avoid costly repairs and keep your system running efficiently, saving money on energy bills. Trust us to provide the expert care your heating system needs to stay reliable and safe throughout the winter.
Our heating services include:
Cincinnati Air Conditioning Services
As complex as you think your furnace is, it’s nothing compared to your air conditioner. In fact, next to your vehicle, it’s probably the most complex piece of machinery you own. As such, it needs regular maintenance. During an annual tune-up, we start by ridding your system of built-up dirt and grime, both of which undercut its effectiveness. We also:
- Check the thermostat settings and controls
- Tighten the electrical connections
- Measure the voltage
- Lubricate the moving parts
- Check the condensate drain
- Check the refrigerant level
It’s a tall order, but then, at National, we always aim high. Our skilled technicians here in Cincinnati are trained for the following air conditioning services:
- Air conditioner installation
- Air conditioner maintenance
- Air conditioner repair
- Commercial Air Conditioning
Connected Home Services
With so many systems at play in your home, having them controlled and connected can be quite useful. Our systems not only monitor your home but also offer solutions for security and lighting control. We offer a variety of home automation services in Cincinnati, including:
- Energy management
- Lighting control
- Home security
- Vehicle detection
- Total home audio
- Irrigation
- Access control
- Home theater
- Pool & spa
- Surveillance cameras
- Internet access & control
Choose National Heating & Air Conditioning in Cincinnati
We see the full range of seasons in Cincinnati, which means that it’s vital to have reliable HVAC services that will keep you comfortable no matter the season. National Heating and Air Conditioning has been in business for over 90 years — we have what it takes to keep your home safe and your family happy.
Contact us online or call us to schedule an appointment with a reliable HVAC company in Cincinnati, Ohio.
Recent Jobs and Reviews in Cincinnati, OH
Job Locations and Reviews
# HVAC Install - Complete System - Commercial
Successfully completed a full commercial HVAC system installation on a rooftop location. Installed a Bryant FJ5ANXA18 air handler unit, Bryant GA4SAN518 1.5-ton air conditioning condenser unit, and 8KW heat pack for apartment heating. Mounted condenser unit on equipment pad with proper clearances and secured all equipment according to manufacturer specifications.
Ran refrigerant lines between outdoor condenser and indoor air handler using black insulated line sets, ensuring proper routing and support. Installed electrical disconnects, whips, and fuses for safe equipment operation and service access. Fabricated and installed sheet metal ductwork to integrate new air handler with existing return and supply duct systems.
Completed all electrical connections, refrigerant line connections, and condensate drain piping. Evacuated refrigerant lines, charged system to manufacturer specifications, and verified proper operation of all components
Successfully completed installation of a complete HVAC system featuring a 96% efficient Preferred Variable-Speed, Constant Torque ECM 2-Stage Standard Gas Furnace paired with a 3.5-ton Mid Tier 146SAN Single Stage R454B Air Conditioner (16 SEER2). System installation included evaporator coil replacement, lineset nitrogen purge, new outdoor pad, disconnect box with fuses, new filter rack, thermostat replacement (Honeywell T6 Pro 3H/2C), and reconnection to existing gas line, flue pipes and humidifier.
Completed installation of a complete HVAC system including a Bryant 3-ton AC unit (GA4SAN536), matching CVAVA3621 coil, and Bryant 912SE60100m21 100,000 BTU 90% efficient furnace. Installation included new thermostat, sheet metal connections to existing flue, electrical components (disconnect, whip, pad, fuses), and proper disposal of old equipment per EPA specifications.
Conducted a commercial HVAC replacement estimate, focusing on a wall-mounted mini-split system. Documented existing conditions including the installation environment and current unit placement near the ceiling with PVC line cover housing refrigerant lines, power, and drainage pipes. Photos were taken to support the estimate documentation for future reference.
Diagnosed and repaired pinhole leak on AMTROL EX-30 expansion tank that was causing boiler control issues. System was continuously activating hot water function even without demand, which was resolved after tank replacement.
Conducted comprehensive evaluation of existing HVAC system, including inspection of digital thermostat and basement equipment configuration. Assessment focused on furnace unit with attached cylindrical humidifier, associated ductwork, and integration with current water heating system to prepare replacement estimate.
Conducted evaluation of aging HVAC system including a Honeywell Chronotherm IV Plus thermostat and basement-installed furnace unit with exposed internal components, ductwork, and PVC venting. Provided replacement estimate for complete system upgrade based on observed equipment condition and performance assessment.
Completed installation of a Bryant complete HVAC system, including Bryant FJ5ANXA18L00 air handler with 10Kw heat and Bryant GA4SAN518 condensing unit. Installation included proper electrical connections with disconnect, whip, and fuses, with appropriate circuit breaker connections for both heating and air conditioning components. Customer retained previous 2022 air handler per request.
Installed a complete Bryant HVAC system including FJ5ANXA18L00 unit with 10 Kw heat, GA4SAN518 air handler, disconnect, whip, and fuses. System was properly mounted on pad against brick wall with all electrical connections secured and refrigerant lines installed according to manufacturer specifications.
Responded to no heat call. Inspected gas pressure regulators showing signs of extended service. Found one regulator with an open access panel exposing copper wire terminals. Confirmed proper operation after service and restored heating function.
Conducted comprehensive assessment for HVAC system replacement in basement utility area. Evaluated existing ductwork components and connections, noting metal cylindrical ducts with ribbed texture and round connectors requiring replacement. Documented current system configuration including proximity to water heater and other mechanical systems, with attention to ceiling clearance and existing utility connections for proper sizing of replacement unit.
Installed an 80% efficient Legacy Gas Furnace (800SB60110M21) with 100k BTU capacity in commercial space. Connected unit to existing flue pipe and evaporator coil for air conditioning, and capped return air on the left side of the system. All connections were properly secured and system was tested for proper operation.
Conducted site visit for commercial HVAC replacement estimate as scheduled. Documented existing system configuration through detailed measurements (74"x2, 42"x2) and photographed the installation area. Reviewed technical specifications including humidifier, refrigeration, wall mounting, drainage, electrical requirements, and thermostat compatibility for appropriate replacement unit sizing and installation planning.
Replaced defective motorized pump component on hot water boiler furnace and reattached the furnace exhaust system. System was operational and able to provide heat before and after service.
Conducted estimate for commercial furnace replacement. Equipment inspection revealed an aging HVAC system with signs of wear, including possible corrosion on metal components and deteriorating connections. Documented existing setup including ductwork, ventilation, PVC drainage, and electrical connections to ensure proper specifications for replacement unit.
Completed assessment of 3-ton AC system that failed last summer due to damaged evaporator coil and condenser. Documented existing Nest thermostat installation and current plumbing configuration in utility area, noting signs of moisture exposure and aging connections. Provided replacement estimate for complete system.
Responded to callback for failed liquid line press fitting. Confirmed system leak with diagnostic testing, showing readings of 24.50 and 0893 on clamp meter. Replaced defective fitting and performed complete system recharge to restore proper operation.
Responded to inspection correction requirements by relocating the union from inside the unit to the exterior as specified. Additionally, rerouted the venting system that was previously discharging onto neighboring property, installing new PVC piping to redirect exhaust to the appropriate side of the building per code requirements.
Performed estimate for replacement of 20-year-old gas furnace and A/C system. Inspected existing Honeywell thermostat (currently displaying 73°F) and evaluated overall HVAC configuration. Documented current system condition with photos to support replacement recommendation.
Responded to no heat service call where thermostat was displaying "Calibrating Heat/Cool disabled" message. Diagnosed thermostat malfunction preventing system from initiating heat cycle. Recalibrated thermostat and restored normal heating operation.
