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!
Contact Us Today (513) 621-4620
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
Contact Us Today (513) 621-4620
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
Erik M.
Completed full commercial HVAC system installation including BCRMA2124S3N3 water fan coil unit installed in interior utility closet and NCP5243000A through-wall AC unit with rooftop condenser. Connected new equipment to existing supply lines using copper piping and fittings, installed new thermostat for system control, and obtained necessary permits for the installation.
Cincinnati, OH 45220
Chris B.
Completed full commercial HVAC system installation including Bryant GA4SAN52400N 2-ton 14 SEER condensing unit, Bryant CVAVA2414 evaporator coil, and Bryant 800SB36070 gas furnace. Flushed refrigerant lines, installed electrical disconnect and whip, fabricated sheet metal transitions to connect to existing supply and return ductwork, and removed existing equipment following EPA disposal specifications. Verified system operation with temperature differential readings and obtained required permit for installation.
Cincinnati, OH 45231
Victoria M.
Conducted comprehensive site assessment of existing boiler system and associated hydronic heating distribution. Evaluated mechanical room equipment including boiler unit, piping infrastructure, pressure regulation components, and terminal heating units throughout the building. Documented current system configuration with photographic reference for estimate preparation.
Cincinnati, OH 45230
Victoria M.
Conducted on-site evaluation for air conditioning system and gas furnace replacement. Assessed existing HVAC equipment accessibility and ductwork configuration in attic space, documented current system layout and provided comprehensive replacement estimate to customer.
Cincinnati, OH 45209
Erik M.
Completed full HVAC system replacement at commercial property including removal and EPA-compliant disposal of existing equipment. Installed new Bryant 3.5-ton split system consisting of GA4SAN542 condensing unit, CVAVA42 evaporator coil, and 912SB42080 80,000 BTU 90% efficiency gas furnace. Relocated furnace from previous location back to attic cubby hole for improved accessibility and space optimization. Ran new refrigerant lineset between outdoor condensing unit and indoor coil, installed new condensate drain pan with proper drainage, and fabricated sheet metal transitions to connect furnace to existing flue system. Mounted condensing unit on new equipment pad with proper gravel base for drainage and stability. Installed electrical disconnect, whip, and fuses for outdoor unit per code requirements. Verified all electrical connections, tested system operation including heating and cooling cycles, and confirmed proper airflow and refrigerant charge. Obtained necessary permit and comple
Cincinnati, OH 45208
Giancarlo L.
Completed full commercial HVAC system installation including First Co 24-RAQ-3 hot water fan coil unit and Bryant GA4SAN524 air conditioning unit. Connected new equipment to existing hot water supply lines with appropriate piping and fittings, installed new thermostat for system control, and verified proper refrigerant pressures and system operation using manifold gauges. All work completed per code requirements with permit obtained, condensate drainage properly routed, and system commissioned successfully.
Cincinnati, OH 45220
Chris B.
Responded to commercial HVAC installation callback to address incomplete condensate drain line that was not installed during original December installation. Installed proper PVC drain piping configuration and verified proper drainage flow. Checked system refrigerant charge using digital multimeter and found system low on refrigerant; added refrigerant to manufacturer specifications and verified proper voltage readings at 239.5V AC.
Cincinnati, OH 45249
Chris B.
Responded to IBI inspection callback to address OCPD deficiency on AC unit. Replaced oversized 25-amp fuses with proper 20-amp Edison ECNR20 time-delay current-limiting fuses to match equipment nameplate specifications and meet code requirements.
Cincinnati, OH 45231
Victoria M.
Conducted on-site evaluation for air conditioning system replacement. Assessed existing dual condenser unit configuration positioned on concrete pad adjacent to building exterior. Inspected electrical service panel containing approximately 20 circuit breakers with main disconnect, confirming adequate electrical capacity and proper service disconnect location for new equipment installation. Documented current HVAC equipment specifications and electrical infrastructure to provide comprehensive replacement estimate. Photographed existing condenser units and electrical panel for equipment sizing and installation planning purposes.
Cincinnati, OH 45237
Erik M.
# HVAC Install - Complete System - Comm Completed full commercial HVAC system installation including Bryant GA4SAN524 air conditioning condenser unit and BCRMA2124S3N3 water fan coil unit. Installed new thermostat for system control and connected equipment to existing supply lines using new pipe and fittings. Mounted outdoor condenser unit on gravel pad against exterior brick wall with proper clearances and secured all refrigerant lines along building structure. Ran electrical connections to wall-mounted junction boxes and conduit. Verified all connections, performed system startup, and confirmed proper operation of both cooling and air handling components. Obtained necessary permit for installation and ensured all work met local code requirements.
Cincinnati, OH 45220
Chris B.
Completed full HVAC system replacement including installation of 926TC66120V24 96% AFUE variable-speed two-stage gas furnace, 135SAN06000W 5-ton single-stage air conditioner with R454B refrigerant rated at 14 SEER2, and CVAVA6024XMA v-coil cased vertical evaporator coil. Performed lineset flush with nitrogen, partial suction line replacement, and installed new disconnect box with fuses. Reconnected unit to existing flue pipes and gas line, retained existing thermostat, filter rack, and condenser pad, and verified all systems operational upon completion.
Cincinnati, OH 45226
Erik M.
Completed full commercial HVAC system installation including Bryant GA4SAN524 air conditioning condenser unit mounted on exterior concrete pad and BCRMA2124S3N3 water fan coil unit installed in interior mechanical closet. Connected refrigerant lines with proper insulation, installed new thermostat, ran copper piping and PVC lines to existing water supply, secured electrical disconnect and conduit, obtained permit, and verified system operation upon startup.
Cincinnati, OH 45220
Victoria M.
Conducted estimate for replacement of 20-year-old residential air conditioning system utilizing R-22 refrigerant with identified leak in outdoor condenser coil. Inspected existing condenser unit positioned on concrete pad against building foundation, documented equipment condition and surrounding installation area, and assessed system for replacement due to age and refrigerant leak rendering repair economically unfeasible.
Cincinnati, OH 45226
Giancarlo L.
# Commercial A/C Installation Complete Successfully installed one Bryant GA4SAN524 air conditioning unit at commercial facility. Installation included running new refrigerant piping and fittings to connect unit to existing supply lines. Performed complete refrigerant charge and system commissioning, verifying proper pressures and temperatures using calibrated manifold gauges. System readings showed 273.8 psig on high side with evaporator temperatures at 10.8°F and 12°F, indicating proper refrigerant flow and heat exchange. Installed new thermostat and wired to unit for proper temperature control. Conducted final system checkout measuring supply air temperature at 59.3°F with 58.7% relative humidity, confirming adequate cooling capacity and dehumidification performance. Obtained necessary permit for installation and completed all work to code requirements. Unit operational and performing to manufacturer specifications.
Cincinnati, OH 45220
Erik M.
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.
Cincinnati, OH 45220
Victoria M.
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.
Cincinnati, OH 45243
Victoria M.
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.
Cincinnati, OH 45202
Austin N.
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.
Cincinnati, OH 45243
Chris B.
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.
Cincinnati, OH 45249
Erik M.
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.
Cincinnati, OH 45202
