Our take in 30 seconds
Best for: mild climates or homes with backup heatStrengths
- Also sold under 1 other badge, so you can compare more quotes for the same unit
Good to know
- Only 52% of its heat output remains at 5°F; plan on backup heat in hard freezes
- Heating efficiency (HSPF2 8.3) is in the lower third of models
- Single-stage compressor runs on/off at full power, so it is less smooth than inverter models
Running-cost calculator
Pre-filled with EIA prices · edit any fieldUses the base certified SEER2 (15.2) and HSPF2 (8.3). Assumes the unit is correctly sized. How we calculate.
Heating capacity as it gets colder
A heat pump's output falls as outdoor temperature drops. This is the certified heat output of the Lennox EL17XP1-042-230A** at the three ENERGY STAR test temperatures (cooling capacity is 42,000 BTU/h for reference).
Retention at 17°F: 66% · at 5°F: 52%. Learn how to use these numbers in our cold-climate guide.
Estimated running cost in every state
Same unit, very different bills: from about $1,167 a year in Louisiana to $4,579 in Maine, driven by local electricity prices and how much heating or cooling the climate needs. Click a column to sort.
| State | Price | Heating | Cooling | Total / yr |
|---|---|---|---|---|
| Louisiana | 12.87¢ | $456 | $711 | $1,167 |
| Florida | 14.99¢ | $341 | $994 | $1,335 |
| Mississippi | 14.43¢ | $657 | $718 | $1,375 |
| Washington | 14.63¢ | $1,259 | $141 | $1,400 |
| Nevada | 12.72¢ | $772 | $633 | $1,405 |
| Tennessee | 13.42¢ | $951 | $482 | $1,433 |
| Arizona | 15.05¢ | $533 | $915 | $1,448 |
| Oregon | 15.92¢ | $1,289 | $198 | $1,487 |
| North Carolina | 14.95¢ | $983 | $537 | $1,520 |
| Kentucky | 13.80¢ | $1,117 | $419 | $1,537 |
| Arkansas | 14.37¢ | $945 | $596 | $1,541 |
| South Carolina | 15.76¢ | $877 | $697 | $1,574 |
| Georgia | 15.90¢ | $885 | $703 | $1,588 |
| Texas | 15.91¢ | $725 | $879 | $1,604 |
| Utah | 13.31¢ | $1,280 | $331 | $1,611 |
| Alabama | 16.33¢ | $909 | $722 | $1,631 |
| Oklahoma | 14.82¢ | $1,050 | $614 | $1,664 |
| Idaho | 13.37¢ | $1,421 | $259 | $1,679 |
| New Mexico | 16.51¢ | $1,253 | $456 | $1,709 |
| Nebraska | 13.54¢ | $1,439 | $337 | $1,776 |
| West Virginia | 16.31¢ | $1,486 | $361 | $1,846 |
| Missouri | 16.02¢ | $1,378 | $487 | $1,865 |
| Virginia | 17.64¢ | $1,339 | $536 | $1,875 |
| Kansas | 15.47¢ | $1,409 | $470 | $1,879 |
| Wyoming | 14.43¢ | $1,825 | $199 | $2,025 |
| Colorado | 17.17¢ | $1,738 | $332 | $2,070 |
| North Dakota | 13.31¢ | $1,953 | $165 | $2,119 |
| Indiana | 17.02¢ | $1,723 | $400 | $2,122 |
| Delaware | 18.70¢ | $1,609 | $517 | $2,125 |
| Montana | 15.57¢ | $1,970 | $194 | $2,163 |
| California | 29.75¢ | $1,355 | $822 | $2,177 |
| South Dakota | 15.15¢ | $1,917 | $272 | $2,189 |
| Iowa | 17.06¢ | $1,986 | $354 | $2,339 |
| Ohio | 19.38¢ | $1,961 | $428 | $2,390 |
| Maryland | 21.40¢ | $1,841 | $591 | $2,432 |
| Illinois | 19.32¢ | $2,053 | $427 | $2,480 |
| Minnesota | 17.20¢ | $2,350 | $261 | $2,611 |
| Pennsylvania | 21.77¢ | $2,203 | $481 | $2,684 |
| Wisconsin | 19.41¢ | $2,455 | $322 | $2,777 |
| New Jersey | 24.61¢ | $2,242 | $612 | $2,854 |
| District of Columbia | 25.98¢ | $2,103 | $790 | $2,893 |
| Connecticut | 24.51¢ | $2,729 | $440 | $3,169 |
| Michigan | 22.99¢ | $2,792 | $381 | $3,173 |
| Vermont | 23.84¢ | $3,137 | $296 | $3,433 |
| Hawaii | 47.18¢ | $119 | $3,390 | $3,509 |
| Rhode Island | 28.18¢ | $3,137 | $467 | $3,604 |
| New York | 28.65¢ | $3,189 | $515 | $3,704 |
| New Hampshire | 27.64¢ | $3,497 | $382 | $3,878 |
| Massachusetts | 30.48¢ | $3,547 | $505 | $4,053 |
| Alaska | 29.41¢ | $4,465 | $81 | $4,546 |
| Maine | 32.11¢ | $4,225 | $355 | $4,579 |
Same equipment sold under other brands
These listings share the same certifying manufacturer (Lennox Industries) and identical certified capacities and efficiency ratings, so they are almost certainly the same hardware with a different badge. If you get quotes for any of them, you are comparing installation price and warranty, not equipment. How rebadging works.
- Lennox ML17XP1-042-230A**
Similar-size alternatives
Other ducted split system units within ±15% of this model's cooling capacity, sorted by efficiency. Cost difference is versus the Lennox EL17XP1-042-230A** at U.S.-average rates.
| Model | Cooling BTU/h | SEER2 | HSPF2 | 5°F kept | Est. yearly cost | |
|---|---|---|---|---|---|---|
| Ruud UP19AY48AJVC | 45,500 | 18–19 | 10 | 92% | $1,827 (−$195) | Compare |
| Heil B5H3V48*K*AAA* | 46,500 | 20–23 | 9.5 | 76% | $1,963 (−$59) | Compare |
| Tempstar T5H3V48*K*AAA* | 46,500 | 19.5–23 | 9.5 | 72% | $2,113 (+$90) | Compare |
| Bryant 37MUHAQ36AA3 | 36,000 | 15.8–18 | 10.3 | 103% | $1,527 (−$495) | Compare |
| Panasonic CU-HM36BAHU | 36,000 | 15.6–17.4 | 10.3 | 103% | $1,533 (−$489) | Compare |
| MrCool CENTRAL-36-HP-C-230B00-O | 36,000 | 15.2–17.4 | 10.3 | 103% | $1,545 (−$477) | Compare |
Full specifications
| Brand | Lennox |
| Outdoor model | EL17XP1-042-230A** |
| Certified by | Lennox Industries |
| Product type | Ducted split system |
| Compressor | Single-stage |
| Refrigerant | R-410A |
| Cooling capacity | 42,000 BTU/h |
| Nominal size | 3.5 tons |
| SEER2 (certified range) | 15.2 – 15.6 |
| EER2 (best) | 13 |
| HSPF2 (best) | 8.3 |
| Heating capacity @ 47°F | 42,000 BTU/h |
| Heating capacity @ 17°F | 27,800 BTU/h |
| Heating capacity @ 5°F | 22,000 BTU/h |
| COP @ 5°F | 2.22 |
| ENERGY STAR cold-climate | No |
| Certified indoor pairings | 188 |
| Latest certification | 2025-10 |
Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), retrieved November 7, 2026. Capacities and HSPF2 are the highest values across certified pairings; confirm your exact system's AHRI reference number with your installer.
Frequently asked questions
How much does the Lennox EL17XP1-042-230A** cost to run per year?
At the U.S. average residential electricity price of 18.16¢/kWh and typical national heating and cooling hours, we estimate about $2,022 per year ($1,470 heating, $552 cooling). It ranges from about $1,167 in Louisiana to $4,579 in Maine.
Does the Lennox EL17XP1-042-230A** work in cold weather?
It is not ENERGY STAR cold-climate certified. It delivers 22,000 BTU/h at 5°F (52% of its 47°F capacity), so in very cold climates expect more reliance on backup heat.
What size is the Lennox EL17XP1-042-230A**?
It is rated at 42,000 BTU/h of cooling, roughly 3.5 tons, and 42,000 BTU/h of heating at 47°F. Proper sizing should be confirmed with a Manual J load calculation.
Is the Lennox EL17XP1-042-230A** the same as the Lennox ML17XP1-042-230A**?
Very likely. Both are certified by Lennox Industries with identical capacities and efficiency ratings in the ENERGY STAR database, which indicates the same equipment sold under different brands.