Gas Furnace AC Combo: Your Essential Buying Guide

Imagine this: it’s a scorching summer day, and your home feels like an oven. Then, winter hits, and suddenly you’re shivering indoors. Switching between powerful heating and cooling systems can feel like a constant battle, often requiring two separate units taking up valuable space and costing you money.

This is where the Gas Furnace Air Conditioner Combo steps in—a single, efficient solution designed to handle all your home comfort needs year-round. But choosing the right combo unit can feel overwhelming. You worry about efficiency ratings, installation costs, and whether one unit can truly handle extreme temperatures. Many homeowners struggle to find the perfect balance between performance and budget.

This guide cuts through the confusion. We will break down exactly what these combo systems are, how they save you space and energy, and the key features you must look for before buying. By the end, you will feel confident knowing exactly which Gas Furnace Air Conditioner Combo fits your home perfectly.

Top Gas Furnace Air Conditioner Combo Recommendations

No. 1
Goodman 1.5 TON 15.2 SEER2 Upflow R-32 AC System with 80% AFUE 80k BTU two stage furnace (GLXS4BA1810 condenser with GR9T800803BN furnace and CAPTA2422B3 coil)
  • R32 Condenser (EPA & Montreal Protocol compliant), Gas Furnace, Eco-Friendly, Compact and Efficient & Provides Home Heating & Cooling
No. 2
Midea Inverter Window Air Conditioner with Heat – Quiet Window AC Unit and Heat Combo with Dehumidifier – Cools up to 550 Sq. Ft. – Energy Star Rated, Smart Control, Remote, 12,000 BTU
  • Multi-Season Comfort – This Midea 12000 BTU air conditioner is more versatile than standard AC units, offering powerful cooling and dehumidification in the summer and reliable supplemental heat in the fall. Best for large rooms up to 550 square feet. Note: Heat pump function will not operate if outside temperature is below 41°F.
  • Easy To Use – This air conditioner and heat unit is well-equipped with a digital LED display, 5 Modes, 3 speed settings, 24-hr Timer, and ECO energy saver. The Swing button adjusts the louvers up/down to direct the airflow. Wireless enabled, control your comfort from your smartphone and your smartwatch using the Midea SmartHome app or your voice via Alexa and Google Assistant. All functions can be set via the control panel, remote control, and app or voice assistant.
  • Save on Energy Without Sacrificing Comfort – This UL Listed, Energy Star certified air conditioner uses inverter technology to quickly cool your bedroom or apartment while providing up to 35% energy savings compared to the Energy Conservation Standard. With 12,000 BTUs, a CEER of 13.3, and 115V operation, this ac unit is loaded with features like auto shutoff, defrost control, and a washable front filter to maintain peak performance.
  • Ultra Low Noise Performance – This ac window unit operates at a noise level as low as 45 dBA. It’s such a quiet air conditioner that you will barely notice it, even when it’s on high. Enjoy your Zoom call, watch your favorite TV show, have a conversation. This ac unit for bedroom also creates just the right amount of white noise so you can get some rest.
  • Install Specs – This window air conditioner is designed to fit double hung windows with opening widths of 24 to 38.5 inches. Lower sash must open sufficiently to allow a clear vertical opening of 14.5 inches. AC window unit measures 19.41"W x 22.17"D x 13.9"H. Included components: 12000 btu window air conditioner, remote control, installation kit. This ac heater combo window unit is as a close as you can get to a mini split a/c. You may like it so much you just might buy two!
No. 3
OXBOX BY TRANE 1.5 Ton Split System Air Conditioner with Gas Furnace – J5AC5018A1000AA, J5GXCC005AC6HUA
  • 1.5-Ton Cooling Capacity (18,000 BTU) – Ideal for small residential spaces
  • Factory-Matched Cased Evaporator Coil – Ensures system compatibility, balanced airflow, and reliable performance
  • Durable Oxbox Construction – Engineered for long-term, dependable operation
  • Efficient Cooling Performance – Helps maintain steady indoor comfort while managing energy use
  • Split-System Design – Flexible installation options for a wide range of residential HVAC applications
No. 4
Goodman 2 TON 14.3 SEER2 Horizontal R-32 AC System with 96% AFUE 80k BTU Low NOx furnace (GLXS4BA2410 condenser with GR9S960803BN furnace and CHPTA2426B3 coil)
  • AIM ACT and Montreal Protocol compliant R32 Refrigerant
  • AC Unit with Natural Gas Heat, Furnace
  • Fully charged for 15’ of tubing length
  • Copper tube enhanced aluminum fin condenser coil
  • AHRI Certified, ETL Listed
No. 5
ACiQ 80% 60,000 BTU Single Stage Gas Furnace - 14" Width - Upflow/Horizontal | 1200 CFM R32, 9-Speed, HVAC Gas Heater
  • CERTIFIED ACiQ SELLERS: Everything you need for reliable HVAC solutions!
  • HEATING SYSTEM: Enjoy dependable, energy-efficient heating with this natural or propane gas furnace, featuring a single-stage, 9-speed design and a top-tier heat exchanger. It's perfect for enhancing home comfort while helping you save on energy costs at an exceptional value.
  • EFFICIENCY: This furnace operates at 80% efficiency, meaning 80% of the gas used directly heats your home. Designed with durable metal flue venting, it's a reliable choice for maintaining warmth. Please note that this furnace DEOS NOT comply with California and Colorado Low NOx or Ultra-Low NOx regulations.
  • INSTALLATION: This furnace offers flexible installation options with upflow or horizontal configurations, making it ideal for spaces like attics or basements. Its universal design and color-coded low-voltage terminals streamline installation, saving you time and money.
  • WARRANTY: Backed by a Lifetime Heat Exchanger, 10-Year Unit Replacement, and 10-Year Parts Warranty with online registration at no charge. Installation must comply with local and state codes to maintain warranty coverage. (Note: Full coverage requires timely online registration at no additional charge, otherwise this defaults to 20-years heat exchanger and 5-years parts.)
No. 6
1HVAC 4 Ton 13.4 SEER2 Central Air Conditioner Condenser with 24.5" Vertical Evaporator Cased Coil with Free Thermostat - R32 Single Stage | 48000 BTU TXV
  • CERTIFIED ACiQ SELLERS: Everything you need for reliable HVAC solutions!
  • AC CONDENSER: Features a high-performance air conditioning unit compressor, copper tube with enhanced aluminum fin coil, and factory-installed filter drier for reliable and efficient operation.
  • EVAPORATOR COIL: Built with an all-aluminum structure, this unit offers superior durability and efficiency, featuring a factory-integrated TXV kit for optimized energy performance.
  • THERMOSTAT INCLUDED: An easy-to-use 2-heat / 1-cool non-programmable thermostat features a bright display, accurate temperature control, flexible gas or electric setup, and helpful features such as filter alerts and compressor delay.
  • DRAGONFLY BOARD: This unit uses R32 refrigerant, which requires a leak detection system. This listing includes the R32 board kit for use with older furnaces or blowers that don’t have one built in.
No. 7
Goodman 4 ton 14.5 SEER2 Complete Split System with upflow coil and single stage 80% AFUE 80k BTU furnace with install accessories! (GLXS4BA4810 CAPTA6030C3 GR9S800805CN)
  • GLXS4BA4810 CAPTA6030C3 and GR9S800805CN replace the following condensers, coils and furnaces: GSX140481,GSX130481,CAPF3743C92,CAPF4860C92,GMES800805CN,GMSS800805CN. If you have any questions, please contact us.
  • Complete Home Comfort Solution: Elevate your living with Goodman's standout R-32 HVAC products. Merge the efficiency of the Goodman 4 Ton Air Conditioner GLXS4BA4810, the steadfast Goodman Gas Furnace GR9S800805CN, and the adaptable Goodman upflow System Coil, CAPTA6030C3 This trio forms a robust system, promising efficient 14.5 SEER2 cooling, consistent heating, and precision in temperature control, all crafted to deliver sustained performance over years.
  • Efficient and Reliable Cooling: Dive into a cooling experience with Goodman's 4 Ton Single Stage GLXS4BA4810. This system runs at 14.5 SEER2. Designed for user-friendliness, it includes service valves, gauge ports, and inspection points. Pre-charged for 15’ of tubing, it's ready to ensure your home's comfort. Couple its enduring build with a reassuring 10-year parts warranty, and you're set for efficient and reliable cooling throughout the year.
  • Advanced, Eco-Friendly Heating: Experience the next-gen heating with Goodman GR9S800805CN Single stage multi-speed upflow ECM Gas Furnace. Touting up to 80% AFUE, this 80k BTU furnace is the standard efficiency. Its unique ECM blower motor ensures efficient, quiet operation, while the stainless-steel heat exchanger and silicon nitride igniter add layers of reliability. This furnace is not just about warmth; it's an eco-conscious choice underlining sustainable living.
  • Upgrade Your HVAC System: Goodman's upflow R-32 only Coil CAPTA6030C3 represents HVAC evolution. Constructed with corrosion-resistant aluminum, it boasts grooved tubing for better heat transfer. Rigorous helium pressure tests during its making vouch for its quality. This combination has been certified by AHRI under certificate number 214860125 to work together as a complete system.
No. 8
Whirlpool 14,000 BTU 230V Through-the-Wall Air Conditioner with Supplemental Heat, Dehumidifier and Remote, Wall AC Unit for Apartment, Living Room and Large Rooms up to 700 Square Feet in White
  • Exceptional Cooling: This powerful, 14,000/13,600 BTU through the wall air conditioner with 10600/8600 BTU supplemental heat (not meant to be used as a primary heat source in the coldest months) is best for spaces up to 700-sq. ft. with an attached, 4.9-ft plug that will fit any 230V/20A electrical outlet
  • Cooling Flexibility: With 8-way directional louvers, 3 fan speeds, and 4 operation modes you can customize your cooling to fit your specific needs
  • Universal Fit Size: With dimensions of 20.3” D x 24.2” W x 14.5” H, this air conditioner fits into sleeves 24.5”-27” wide and comes with a trim kit and rear grille to finish off the look
  • Convenient Functions: The Eco and Sleep functions save you money throughout the day and night while keeping you cool while the programmable 24-hour timer allows you to cool on your schedule
  • Easy Remove Filter: The unit features a quick-access filter for easy cleaning so you can simply pull it out, wipe the filter clean, and push back into the unit

Your Complete Guide to Buying a Gas Furnace Air Conditioner Combo System

A gas furnace and air conditioner combo system is a smart choice for many homes. It heats your house in the winter and cools it in the summer, all with one main setup. This guide will help you pick the best one for your needs.

Key Features to Look For

When shopping, look closely at these important parts. They make a big difference in how well your system works and how much money you save.

Energy Efficiency Ratings

  • AFUE (Annual Fuel Utilization Efficiency): This tells you how well the furnace part converts fuel into heat. Higher numbers (like 90% or more) mean less wasted energy and lower gas bills.
  • SEER (Seasonal Energy Efficiency Ratio): This rating applies to the air conditioner part. A higher SEER rating means better cooling for less electricity. Look for 14 SEER or higher for good savings.

System Capacity and Sizing

The system must be the right size for your home. Too small, and it runs constantly. Too big, and it cycles on and off too quickly, which wastes energy and doesn’t dehumidify well.

  • Have a professional perform a “Manual J” calculation. This measures your home’s specific heating and cooling needs.

Comfort Features

  • Variable Speed Blower: This fan can run at different speeds. It moves air more evenly, keeping temperatures steady and reducing noise.
  • Two-Stage or Modulating Heating: Instead of just being “on” or “off,” these furnaces can run at lower power levels when you only need a little heat. This saves energy and improves comfort.

Important Materials and Build Quality

The materials used affect how long your combo unit lasts. Good construction means fewer repairs down the road.

Heat Exchanger

This is the heart of the furnace. It separates the burning gas from the air that blows into your home.

  • Stainless Steel: Most modern, high-efficiency furnaces use stainless steel. It resists rust and handles high temperatures well. Low-efficiency models sometimes use less durable metal.

Cabinet and Components

The outer shell protects the inner parts. Look for thick, coated metal cabinets that resist rust, especially if your unit sits outside or in a damp basement.

Factors That Improve or Reduce Quality

Certain design choices make a unit better or worse over time.

Factors That Improve Quality (Better Performance)

  • Electronic Controls: Modern circuit boards manage the system more precisely than older mechanical switches. This leads to smoother operation.
  • Good Warranty: A long warranty (especially 10 years on parts) shows the manufacturer trusts their product quality.

Factors That Reduce Quality (Potential Problems)

  • Single-Stage Operation: These older designs are less efficient because they are either running at full blast or completely off.
  • Cheap Components: If a manufacturer uses lower-quality fans or sensors, these parts often break sooner, leading to expensive repairs.

User Experience and Use Cases

Think about how you live in your home. This affects the best choice for you.

Quiet Operation

If your furnace/AC unit is near a bedroom or living area, noise matters. Variable speed systems and well-insulated cabinets offer much quieter performance than older, noisy models.

Climate Suitability

  • Cold Climates: Prioritize a furnace with a high AFUE rating (95% or higher) because you will use the heating part most often.
  • Hot and Humid Climates: Focus on a high SEER rating. Good AC performance means lower electricity bills during the summer, and the variable speed blower helps remove extra moisture from the air, making the home feel cooler.

10 Frequently Asked Questions (FAQ)

Q: What is the main advantage of a combo unit?

A: The main advantage is convenience and potentially lower installation costs. You deal with one main system for both heating and cooling.

Q: How long does a gas furnace AC combo system usually last?

A: With regular maintenance, these systems generally last between 15 to 20 years. The AC coil sometimes needs replacement sooner than the furnace.

Q: Do I need two separate thermostats for a combo unit?

A: No. Most modern combo systems use a single, smart thermostat that controls both the heating (gas furnace) and the cooling (AC) functions.

Q: What does “modulating” mean for a furnace?

A: Modulating means the furnace can adjust its heat output in very small steps, sometimes from 40% up to 100% power. This keeps the temperature very steady.

Q: Is a high AFUE rating always better?

A: A high AFUE is great for saving fuel, but it often means the unit costs more upfront. You must calculate if the fuel savings will cover the extra cost over the system’s lifespan.

Q: Can I use my old AC unit with a new high-efficiency furnace?

A: Sometimes, but it is not recommended. Efficiency ratings must match up. Mixing old and new parts often limits the performance and voids some warranties.

Q: What is the biggest difference between two-stage and single-stage systems?

A: Single-stage units run at 100% power always. Two-stage units can run at a lower, more efficient setting (like 60%) most of the time, saving energy.

Q: How often should I service this type of system?

A: You should have a professional service both the furnace and the air conditioner once a year. Usually, service the furnace in the fall and the AC in the spring.

Q: What is the role of the blower fan in the combo system?

A: The blower fan moves the heated air from the furnace or the cooled air from the AC coil through your ductwork to all the rooms in your house.

Q: Does the gas furnace part need a lot of maintenance?

A: Yes. You must replace the air filter regularly to keep the furnace clean. The gas burners also need annual inspection to ensure safe and efficient burning.