ClimateMaster

ClimateMaster is one of the largest US manufacturers of geothermal heat pump systems for residential and commercial applications. Founded in 1956 and headquartered in Oklahoma City, Oklahoma, the company operates as a subsidiary of LSB Industries and remains an active market leader in 2026. This page covers the current product lineup, refrigerant transition, efficiency ratings, pricing, federal incentive status, and how to locate certified installers.

Company History and Overview

ClimateMaster has manufactured ground source heat pump equipment from its Oklahoma City facility for nearly seven decades. The company focuses primarily on geothermal and water-source heat pump technology rather than the broader HVAC categories. That specialization has produced a continuous Trilogy and Tranquility line refresh and the industry's first AHRI-certified ground source heat pump to exceed 45 EER, the Trilogy 45 QE.

Independent of equipment selection, installation quality determines real-world performance. The 2026 trade press has continued to emphasize that ground source heat pump efficiency depends on loop sizing, flow balancing, and contractor experience as much as on the heat pump nameplate.

ClimateMaster Product Lines (2026)

The current residential catalog (per the RP917 Residential All-Products Guide) is organized by tier:

• Trilogy 45 (QE) Q-Mode: Variable-capacity packaged system, two cabinet sizes (0930, 1860). AHRI-certified above 45 EER, ENERGY STAR Tier 3. Q-Mode logic prioritizes simultaneous heating, cooling, and domestic hot water on the same system.
• Trilogy 45 (VE): Variable-capacity packaged with fully variable compressor, blower, and loop pump. Originally launched March 2020 and continuously refreshed.
• Tranquility 30 (SE / TT / TE): Two-stage premier line, 2 to 6 tons, R-454B, vFlow variable water flow, double-isolation compressor mounting. Packaged TT/TE variants reach 29.6 EER.
• Tranquility 27 / 22 / 20 (TS): Mid-tier single-stage and digital lines in the 22 EER class.
• Tranquility 18 (SR): Versatile single-stage line shipping with R-454B (e.g., the SRR042 3.5-ton).
• Tranquility Indoor Split (TTS, TES, TEP) and Premier Split (SJ-SP): Split configurations for crawl-space or second-floor retrofits.
• Tranquility Water-to-Water (TMW) and Tranquility Fluid Cooler (TFC): Radiant + DHW and hybrid-loop applications.
• Tranquility SL Low-Profile: Launched 2025 for low-headroom multifamily and light commercial settings, reported by ACHR News. Primarily a commercial/multifamily product, useful in apartment retrofits.

Loop selection (vertical closed, horizontal closed, pond, or open) is determined at site assessment by the installing contractor based on lot size, soil thermal conductivity, and groundwater availability.

Refrigerant Transition: R-410A to R-454B

Under the EPA's AIM Act technology transitions rule, residential heat pumps manufactured after January 1, 2025 must use a low-GWP refrigerant. ClimateMaster has confirmed R-454B on multiple residential SKUs (Tranquility 18 SR, Tranquility 30 SE, vertical SCK lines) and published the dedicated RP917 Residential All-Products Guide covering R-454B units. A separate commercial all-products guide was published July 23, 2025. Some legacy R-410A units remain in inventory clearance literature; ask your installer to confirm refrigerant on the specific model quoted.

Efficiency Ratings and Performance

ClimateMaster's published, AHRI-certified efficiencies cover a broad range:

• Trilogy 45 (QE/VE): above 45 EER (per AHRI Directory certification)
• Tranquility 30 (TT/TE): 29.6 EER
• Tranquility 22/27 class: 22 EER class
• Heating COP across the lineup: typically 3.5 to 5.0+ depending on stage and entering water temperature

EPA reports geothermal energy savings of 30 to 70 percent on heating costs and 20 to 50 percent on cooling, depending on climate zone and the fuel being displaced. Homes replacing electric resistance or fuel oil typically capture savings near the top of the range; homes replacing a modern 97 percent gas furnace see the lower end. Equipment-only nameplate efficiency does not by itself produce these savings; loop design, distribution, and controls matter.

For a side-by-side perspective on ClimateMaster relative to air-source equipment, see geothermal vs air source heat pump.

ClimateMaster Geothermal System Pricing

The 2026 national average installed cost for a 3-ton residential ground-source system is approximately $25,500, with a typical range of $20,000 to $27,000 in standard soil and $35,000 to $50,000+ in granite or hard-rock terrain (RSMeans). ClimateMaster equipment falls within this range; final pricing depends on cabinet (Trilogy vs Tranquility), loop type, and labor market.

• Equipment only (residential): approximately $8,000 to $15,000 depending on tier and capacity
• Complete installation (3-ton, vertical loop): $20,000 to $35,000 including loop, plumbing, wiring, and labor
• Drilling share: 50 to 70 percent of total project cost for vertical closed loops

Costs have risen above 4 percent year-over-year for three consecutive years, driven primarily by specialized labor wage inflation. See our geothermal installation cost guide for state-by-state ranges and financing paths.

Federal Tax Credits and Rebates (2026)

The federal §25D Residential Clean Energy Credit was terminated for new residential geothermal expenditures completed after December 31, 2025 by the One Big Beautiful Bill Act, signed July 4, 2025 (P.L. 119-21). The Inflation Reduction Act schedule that previously extended §25D through 2032 was nullified for new installations.

Practical implications for homeowners considering ClimateMaster equipment in 2026:

• 2025 installations completed before the cutoff remain eligible. Unused credit can carry forward via IRS Form 5695.
• The §48 commercial Investment Tax Credit remains active for geothermal at a 6 percent base, scaling up to 30 percent with domestic-content, prevailing-wage, energy-community, or apprenticeship adders. It phases down through 2034. Third-party-owned residential leases (TPO) can claim §48 and pass savings to the homeowner via reduced lease payments — a structure increasingly used in 2026.
• HEEHRA (HEAR) §50122 offers up to $8,000 toward heat pump installation including GSHP, income-tiered (under 80 percent AMI = full, 80 to 150 percent = 50 percent). Administered by states; rollout varies.
• State and utility programs remain primary residential incentives. ClimateMaster systems remain eligible for these — see geothermal rebates by state.
• Use the geothermal tax credit calculator for a 2026 estimate.

Pros and Cons of ClimateMaster Systems

Advantages

• Trilogy 45 line is the only AHRI-certified residential GSHP exceeding 45 EER as of 2026
• Established US manufacturer with parts depth and a contractor network across all 50 states
• vFlow variable water flow, iGate communicating thermostat, and Q-Mode (Trilogy QE) for simultaneous heating/cooling/DHW
• R-454B residential transition underway with the dedicated RP917 product guide already published
• Long equipment lifespan: indoor unit 20 to 25 years; ground loop 50 years or more
• Eligible for §48 commercial credits via TPO leasing, plus state and utility rebates

Disadvantages

• Higher upfront installation cost than conventional HVAC; payback typically 5 to 10 years with state incentives, 10 to 15 years without
• Federal §25D residential credit is no longer available for new 2026 installations
• Vertical-loop drilling is disruptive and costs more in granite/hard-rock terrain
• Requires a contractor with geothermal-specific training; loop sizing errors are the most common cause of underperformance
• Some Tranquility/Trilogy SKUs may still ship from inventory in R-410A; verify refrigerant on the specific model quoted

Home Value and Long-Term Return

Geothermal installation typically increases home value by $8,700 to $15,000 per NAHB and Lawrence Berkeley National Laboratory data, with higher figures documented in luxury or oil-displacement markets. Modeled internal rate of return for residential GSHP runs 6 to 8 percent over a 25-year horizon (peer-reviewed and IEA modeling), reaching 10 to 12 percent in cold-climate scenarios that displace fuel oil. These figures assume system performance close to AHRI ratings; recent field data shows GSHPs miss expected efficiency at only a 2 percent rate, compared with 17 percent for air-source units (2025 study, 1,000+ units).

Finding a ClimateMaster Contractor

Installation quality matters as much as equipment quality. ClimateMaster recommends working with contractors trained on its product line and certified by the International Ground Source Heat Pump Association (IGSHPA). GeothermalFinder maintains a directory of IGSHPA certified contractors across all 50 states.

You can find a geothermal contractor near you by entering your zip code. Certified contractors will size loops using our geothermal loop calculator and verify the refrigerant version on the specific Tranquility or Trilogy SKU before quoting.

Frequently Asked Questions

How long do ClimateMaster systems last?

Indoor heat pump units typically last 20 to 25 years. Ground loops often operate for 50 years or more, making them one of the longest-lived components in residential HVAC.

Do ClimateMaster systems require much maintenance?

Maintenance is minimal — see our geothermal maintenance guide. Routine work is air filter replacement, periodic loop pressure checks, and refrigerant inspection during scheduled service.

What's the difference between Trilogy 45 and Tranquility?

Trilogy 45 (QE/VE) is the variable-capacity flagship — the QE adds Q-Mode logic for simultaneous heating, cooling, and DHW priority. Tranquility 30 is the two-stage premier tier; Tranquility 27/22/20 are mid-tier single-stage; Tranquility 18 (SR) is the versatile single-stage entry. Indoor splits (TTS/TES/TEP) and water-to-water (TMW) cover retrofit and radiant scenarios. Your contractor will recommend a specific SKU based on climate zone, load, and loop type.

Do ClimateMaster units use R-454B in 2026?

Multiple residential SKUs are confirmed shipping with R-454B (Tranquility 18 SR, Tranquility 30 SE, vertical SCK lines), per the published RP917 Residential All-Products Guide. Some inventory still ships R-410A; ask your installer to confirm refrigerant on the specific model number quoted.

Can I install ClimateMaster in any climate?

Yes. Ground temperature 6 to 10 feet below grade remains relatively stable year-round across US climate zones, which is the basis of GSHP performance. Equipment selection and loop sizing must match the heating- or cooling-dominated zone — see the geothermal heat pump guide for climate-specific notes.

How does ClimateMaster compare to other heating systems?

See our detailed comparison in pros and cons of geothermal.