Matching models, side by side
A sample of 8 twin pairs across the size range. Each pair is certified by the same manufacturer with identical cooling and heating capacities, efficiency ratings, compressor type and refrigerant.
| Lennox model | Armstrong Air model | Cooling BTU/h | SEER2 | HSPF2 | Heat at 5°F | Compressor |
|---|---|---|---|---|---|---|
| EL17XP1-018-230A** | 4SHP17LE118P-**A | 18,000 | 15.2–16.8 | 8.5 | 54% | Single-stage |
| EL16KP1-018-230A** | A7HP14F18P-**A | 18,000 | 15.2–16.5 | 7.8 | 47% | Single-stage |
| EL17XP1-024-230A** | 4SHP17LE124P-**A | 24,000 | 15.2–17 | 8.2 | 51% | Single-stage |
| EL16KP1-024-230A** | A7HP14F24P-**A | 24,000 | 15.2–16 | 8.2 | 50% | Single-stage |
| EL17XP1-030-230A** | 4SHP17LE130P-**A | 30,600 | 15.2–16.2 | 8.6 | 51% | Single-stage |
| EL17XP1-036-230A** | 4SHP17LE136P-**A | 36,000 | 15.2–16.8 | 8.7 | 54% | Single-stage |
| EL16KP1-042-230A** | A7HP14F42P-**A | 42,000 | 15.2–15.5 | 8.2 | 51% | Single-stage |
| ML17XP1-048-230A** | 4SHP17LE148P-**A | 48,000 | 15.2–15.8 | 8.5 | 55% | Single-stage |
So what actually differs?
- Price. Twin units are often priced differently because they reach you through different distributors and dealers. Getting quotes for both brands is the easiest way to save on identical equipment.
- Warranty. Parts-warranty length and registration rules can differ by brand. Read the warranty sheet for the exact model you're quoted.
- Installer. The contractor's installation quality affects efficiency and lifespan more than the badge does.
- Cabinet and controls. Some twins differ cosmetically or in the thermostat they pair with best.
Not every model is a twin: Lennox and Armstrong Air each also sell products the other doesn't. Look up your exact model in our directory to check.
Frequently asked questions
Are Lennox and Armstrong Air heat pumps the same?
Only for a few models. In the ENERGY STAR database, 10 distinct Armstrong Air heat pump products have an identical Lennox counterpart — same manufacturer and identical certified capacity and efficiency. That is 17% of Armstrong Air's certified heat pumps and 7% of Lennox's.
Is Lennox better than Armstrong Air?
When the units are twins, the hardware and its certified performance are the same. Differences come from warranty terms, dealer network, installation quality and price — compare written quotes on those points.
How do I check whether my Armstrong Air quote matches a Lennox model?
Ask the contractor for the outdoor model number and the AHRI reference number, then look the model up in our directory. Each model page lists the other brands the same unit is sold under.