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
Completed full HVAC system installation for commercial application including one BCRMA2124S3N3 water fan coil unit installed in basement utility area with copper piping connections to existing water supply lines, one Bryant GA4SAN524 air conditioning condensing unit positioned on exterior equipment pad with electrical conduit and disconnect properly mounted to brick wall, new thermostat installation, and all necessary pipe fittings and connections. All equipment tested and verified operational, permit obtained, and system commissioned per manufacturer specifications.
Conducted comprehensive assessment of existing furnace system located in basement mechanical room. Evaluated current HVAC unit, associated ductwork, and integrated humidification system to determine replacement options and provide detailed estimate for complete furnace replacement.
Conducted comprehensive on-site assessment for furnace replacement in residential mechanical closet. Evaluated existing Carrier gas furnace system, documenting current installation configuration including blower motor assembly, electrical connections, control boards, and internal components. Photographed exposed internal systems showing existing wiring infrastructure, PVC venting arrangement, and ductwork connections. Assessed mechanical room layout with vertically stacked HVAC equipment and water heater to determine replacement unit specifications and installation requirements. Provided detailed replacement estimate based on current system configuration and space constraints.
Responded to thermostat issue reported by homeowner. Upon arrival, verified system operation and confirmed both heating and cooling functions working properly. Documented equipment information for Trane XR heat pump unit (Model: 4TTR7048B1000AA, Serial: Z114MN45F, manufactured March 2022) and assessed thermostat functionality, noting age of thermostat unknown but system responding to temperature calls correctly.
Completed full commercial HVAC system replacement including installation of Bryant FMA5X2400AL R-454B air handler with 8kw electric heat pack and Bryant GA4SAN51800N 1.5-ton 14 SEER condenser utilizing R-454B refrigerant. Flushed and reused existing refrigerant lines, fabricated and installed sheet metal connections to existing supply and return ductwork, installed outdoor disconnect with whip, pad, and fuses, obtained permit, and disposed of old equipment per EPA specifications with system tested and operational upon completion.
Completed commercial mini split system installation including SEZ-KD12NA4R1 indoor unit and SUZ-KA12NAHZ outdoor condenser with 454B refrigerant. Utilized crane to position outdoor unit on roof, installed line set with flush and pressure test to verify no refrigerant leaks, fabricated and installed sheet metal supply and return connections, and installed electrical disconnect with fuses, whip, and pad. System was properly charged to manufacturer specifications, all work performed under permit, and existing equipment was disposed of per EPA regulations.
Completed full HVAC system installation for commercial property including demolition of existing equipment. Installed First Co 24-RAQ-3 hot water fan coil unit and Bryant 1.5-ton GA4SAN518 air conditioning unit rated at 14 SEER efficiency with R-410A Puron refrigerant. Fabricated and installed custom sheet metal ductwork to connect new equipment to existing supply and return air systems. Installed outdoor condensing unit on equipment pad with electrical disconnect switch. Flushed and tested refrigerant lines for proper operation. Installed new thermostat and verified all electrical connections at breaker panel. System tested and operational upon completion.
Completed full HVAC system replacement including installation of new Carrier furnace and air conditioning unit. Installed Nest smart thermostat with proper wiring configuration connecting Y1, G, RC, W1, C, and RH terminals. Routed and secured all ductwork, condensate drainage lines, and venting systems per manufacturer specifications and local building codes.
# 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.
