Lennox
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Wide portfolio of residential ducted systems, including furnaces, central AC, and air-source heat pumps
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Exclusive Dave Lennox Signature® Collection with variable-capacity technology
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High-efficiency models reaching SEER2 up to 28 and AFUE up to 99%
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Known for SilentComfort™ Technology reducing operational noise
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Strong emphasis on environmentally friendly refrigerants and sustainable design
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Smart thermostat integration through Lennox iComfort® S30 for precision control
Heil
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Ion™ 98 G97CMN Gas Furnace with up to 98% AFUE and modulating gas valve
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Ion™ 21 Variable-Speed Air Conditioner with inverter technology and up to 20.5 SEER2
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Ion™ Variable-Speed Heat Pump (HVH8) delivering up to 19 SEER2 and 11 HSPF2
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Ion™ System Control provides full smart-home integration and real-time diagnostics
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Part of ICP (Carrier Global), sharing advanced engineering with Carrier and Bryant
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10-year No Hassle Replacement™ warranty on premium Ion series equipment
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Lennox HVAC
Among the major names in HVAC, Lennox stands out for its long heritage and reputation for pushing the limits of efficiency. For this review, I focused on three cornerstone products that reflect the brand’s residential ducted portfolio: the SLP99V Gas Furnace, the SL28XCV Variable-Capacity Air Conditioner, and the XP25 Variable-Capacity Heat Pump. Together, these models showcase what Lennox brings to homeowners who demand consistent comfort, low energy bills, and technology that balances innovation with real-world reliability. Over years of field testing and speaking with homeowners, I’ve seen both the strengths and the areas where Lennox could improve, and this review reflects that balance.
Heil HVAC
Heil may not be the first HVAC brand homeowners think of, but industry insiders know it as part of ICP (International Comfort Products)—the same corporate family that builds Carrier and Bryant systems. This means Heil equipment often shares the same engineering DNA as its premium siblings, but is marketed at a slightly lower price point with fewer flashy brand campaigns.
For this review, I’ll focus on Heil’s flagship Ion™ series: the Ion 98 G97CMN Furnace, the Ion 21 Variable-Speed Air Conditioner, and the Ion Variable-Speed Heat Pump HVH8. Together, these represent Heil’s top technology tier, blending high efficiency, modulating or inverter-driven performance, and smart connectivity. In my experience, Heil appeals to homeowners who want near-premium comfort without paying Carrier Infinity pricing.
