Trane Split Gas Systems
Trane split gas systems pair a high-efficiency air conditioner with a gas furnace. The AC condenser sits outside, the gas furnace and evaporator coil sit inside (typically in a closet or attic), connected by refrigerant lines. This is the traditional setup for homes with natural gas service.
While heat pumps have become our primary recommendation for most Arizona homes (they handle both cooling and heating more efficiently in our mild winters), split gas systems remain a solid option for homeowners who prefer gas heating or have existing gas infrastructure. The AC condenser in each tier uses the same compressor and coil technology as the heat pump version, so cooling performance is identical.
Why Choose a Split Gas Systems?
Choose a split gas system when your home has existing gas infrastructure and you prefer gas heating, your natural gas rates make gas heating more economical, you want the rapid, high-temperature heating feel of a gas furnace, or you're replacing an existing gas system and want to keep the same configuration.
The furnace in a split gas system can be either 80% AFUE (standard efficiency) or 95%+ AFUE (high efficiency condensing). We'll recommend the right furnace based on your home, budget, and heating needs. The furnace is a separate purchase from the AC condenser.
Compare Split Gas Systems Models
| Specification |  Value |  Enhanced |  Premium |
|---|---|---|---|
| SEER2 Rating | Up to 15.2 | Up to 17.4 | Up to 19.2 |
| Compressor | Climatuff Single-Stage | Multi-Speed Inverter | Climatuff Variable-Speed |
| Stages | Single | Multi-Stage (6 speeds) | Variable |
| Sound Level | As low as 72 dB | As low as 68 dB | As low as 55 dB |
| Warranty | 10-Year Limited Parts | 12-Year Limited Parts | 12-Year Limited Parts |
| Comfort | ★★☆☆☆ | ★★★★☆ | ★★★★★ |
| Efficiency | ★★☆☆☆ | ★★★★☆ | ★★★★★ |
| Learn More | Learn More | Learn More |
Choice 14 Gas System
Value Priority 17 Gas System
Enhanced Premier 18 Gas System
PremiumNot sure what these compressor types mean?
Understanding the difference between single-stage, multi-stage, and variable-speed is one of the most important decisions when choosing a new system.
Read Our Compressor GuideOur Expert Recommendation
If you need a gas system, our recommendation mirrors the heat pump lineup: the Priority 17 (XR17) is the sweet spot. Its multi-speed inverter compressor delivers the same cooling comfort advantages as the heat pump version, and the gas furnace handles heating with rapid, high-temperature output.
That said, for most Arizona homes we recommend considering a heat pump instead. Heat pumps use the same outdoor unit for both cooling and heating, eliminating the need for a separate gas furnace. They're more efficient for heating in our mild winters and don't require gas service. If you're not committed to gas, check out our split heat pump lineup.
All Trane Split Gas Systems Models
Detailed information on each model in the Trane Split Gas Systems lineup.
Choice 14 Gas System
ValueChoice 14 / formerly XR15
Model: 5TTR4
Priority 17 Gas System
EnhancedPriority 17 / formerly XR17
Model: 5TTR7
Premier 18 Gas System
PremiumPremier 18 / formerly XV18
Model: 5TTV8
Choice 16 Gas System
EnhancedChoice 16 / formerly XR16
Premier 20 Gas System
UltraPremier 20 / formerly XV20i
The Choice 16 AC offers a modest efficiency improvement over the Choice 14 but remains single-stage. Its installed cost is close to the Priority 17, which delivers a much bigger jump in cooling comfort with its multi-speed inverter compressor. The Premier 20 is Trane's efficiency peak, but the real-world cooling comfort is nearly identical to the Premier 18 at a higher price.
A2L Refrigerant Transition
All current Trane split gas system AC condensers use R-454B (A2L) refrigerant, replacing R-410A. If you received a quote with a 4TTR or 4TTV model number, that was the R-410A version. Current models use 5TTR or 5TTV prefixes. Cooling performance is identical. The gas furnace side is not affected by this change.
Frequently Asked Questions
Common questions about Trane Split Gas Systems systems answered by our team.
Ask Us DirectlyFor most Arizona homes, we recommend a heat pump. They provide both cooling and heating in one system and are significantly more efficient for heating in our mild winters. Gas systems make sense if you have low gas rates, prefer rapid gas heating, or have existing gas infrastructure you want to keep.
The cooling performance is identical. Both use the same compressor and coil technology at each tier. The difference is that a heat pump condenser has a reversing valve to also provide heating, while a gas system condenser only handles cooling. The gas furnace handles heating separately.
The furnace is selected based on your home size, ductwork, and the AC tier. Standard 80% AFUE furnaces work well for most Arizona homes since heating demand is low. High-efficiency 95%+ AFUE condensing furnaces save more on gas bills but cost more upfront. For the Premier 18 and 20 AC, we recommend a communicating furnace (like the S9V2) to take full advantage of the ComfortLink II system.
Interested in a Trane Split Gas Systems?
We'll size the right system for your home, walk you through all the options, and give you a straightforward quote.