Apply to be a TradeMaster!
Filter menu expanded

Filters

13,101 items
Reset

SORT

Product Availability
–

Show In Stock Only (3586)
Reno (87)

Product Type
–

Blower (91)
Blower Assembly (27)
Blower Wheel (58)
Bracket (5)
Burner (5)
Compressor (62)
Contactor (22)
Control Board (31)
Control Module (6)
Drain Pan (36)

Price Range
–

Under $1 (1)
$1 to $5 (35)
$5 to $10 (66)
$10 to $15 (57)
$15 to $20 (50)
$20 to $25 (75)
$25 to $30 (91)
$30 to $35 (89)
$35 to $40 (107)
$40 to $45 (99)

York

York
Help Face
Need a little help?
13101 items
Grid
List
Compare
Product Image of Multi Cogged Drive Belt, AX44, S1-AX44
Multi Cogged Drive Belt, AX44, S1-AX44
SKU: S1-AX44
York
SKU: S1-AX44
Brand: York
$25.70 each
In Stock
Get 5 by Mon, Oct 19
In Stock
Get 5 by Mon, Oct 19
Compare
Product Image of Multi Cogged Drive Belt, AX53, S1-AX53
Multi Cogged Drive Belt, AX53, S1-AX53
SKU: S1-AX53
York
SKU: S1-AX53
Brand: York
$31.74 each
In Stock
Get 10 by Mon, Oct 19
In Stock
Get 10 by Mon, Oct 19
Compare
Product Image of Hard Start Kit Replacement, S1-2SA06710206
Hard Start Kit Replacement, S1-2SA06710206
SKU: S1-2SA06710206
York
SKU: S1-2SA06710206
Brand: York
$122.41 each
Backorder
Get it by Fri, Nov 13 - Mon, Dec 14
Backorder
Get it by Fri, Nov 13 - Mon, Dec 14
Compare
Product Image of 277v1ph 3/4hp 1050rpm Motor, S1-3102012011
277v1ph 3/4hp 1050rpm Motor, S1-3102012011
SKU: S1-3102012011
York
SKU: S1-3102012011
Brand: York
$361.72 each
Backorder
Get it by Fri, Nov 13 - Mon, Dec 14
Backorder
Get it by Fri, Nov 13 - Mon, Dec 14
Compare
Product Image of Sequencer Replacement, S1-3110-3541
Sequencer Replacement, S1-3110-3541
SKU: S1-3110-3541
York
SKU: S1-3110-3541
Brand: York
$126.38 each
Backorder
Get it by Fri, Nov 13 - Mon, Dec 14
Backorder
Get it by Fri, Nov 13 - Mon, Dec 14
Compare
Product Image of Relay Replacement, S1-3115A3301
Relay Replacement, S1-3115A3301
SKU: S1-3115A3301
York
SKU: S1-3115A3301
Brand: York
$39.57 each
Backorder
Get it by Fri, Nov 13 - Mon, Dec 14
Backorder
Get it by Fri, Nov 13 - Mon, Dec 14
Compare
Product Image of 1/4 HP Condensor Motor (208-230V, 1120 RPM), S1-324-25801-002
1/4 HP Condensor Motor (208-230V, 1120 RPM), S1-324-25801-002
SKU: S1-324-25801-002
York
SKU: S1-324-25801-002
Brand: York
$278.20 each
Backorder
Get it by Fri, Nov 13 - Mon, Dec 14
Backorder
Get it by Fri, Nov 13 - Mon, Dec 14
Compare
Product Image of 1HP Programmed ECM Module Replacement, S1-324-32015-050
1HP Programmed ECM Module Replacement, S1-324-32015-050
SKU: S1-324-32015-050
York
SKU: S1-324-32015-050
Brand: York
$517.95 each
Backorder
Get it by Fri, Nov 13 - Mon, Dec 14
Backorder
Get it by Fri, Nov 13 - Mon, Dec 14
Compare
Product Image of 3/4" One-Shot Process Valve, S1-3924-3051
3/4" One-Shot Process Valve, S1-3924-3051
SKU: S1-3924-3051
York
SKU: S1-3924-3051
Brand: York
$216.56 each
Backorder
Get it by Fri, Nov 13 - Mon, Dec 14
Backorder
Get it by Fri, Nov 13 - Mon, Dec 14
Compare
Product Image of Multi Cogged Drive Belt, AX57, S1-AX57
Multi Cogged Drive Belt, AX57, S1-AX57
SKU: S1-AX57
York
SKU: S1-AX57
Brand: York
$29.65 each
In Stock
Get 5 by Mon, Oct 19
In Stock
Get 5 by Mon, Oct 19
Compare
Product Image of 22' Lift Condenser Pump Low-Prof, S1-CP-22LP
22' Lift Condenser Pump Low-Prof, S1-CP-22LP
SKU: S1-CP-22LP
York
SKU: S1-CP-22LP
Brand: York
$69.95 each
Backorder
Get it by Fri, Nov 13 - Mon, Dec 14
Backorder
Get it by Fri, Nov 13 - Mon, Dec 14
Compare
Product Image of EOM ECM Programmed Blower Motor (3/4 HP), S1-324-36074-427
EOM ECM Programmed Blower Motor (3/4 HP), S1-324-36074-427
SKU: S1-324-36074-427
York
SKU: S1-324-36074-427
Brand: York
$994.99 each
Backorder
Get it by Fri, Nov 13 - Mon, Dec 14
Backorder
Get it by Fri, Nov 13 - Mon, Dec 14
Compare
Product Image of 120/240v 1hp ECM Motor, S1-324-36086-400
120/240v 1hp ECM Motor, S1-324-36086-400
SKU: S1-324-36086-400
York
SKU: S1-324-36086-400
Brand: York
$2,142.45 each
Backorder
Get it by Fri, Nov 13 - Mon, Dec 14
Backorder
Get it by Fri, Nov 13 - Mon, Dec 14
Compare
Product Image of Adapter Media For M13PAC2020 (M8) Kit, S1-FRKIT313
Adapter Media For M13PAC2020 (M8) Kit, S1-FRKIT313
SKU: S1-FRKIT313
York
SKU: S1-FRKIT313
Brand: York
$26.04 each
In Stock
Get 1 by Mon, Oct 19
In Stock
Get 1 by Mon, Oct 19
Compare
Product Image of Programmable EON ECM Motor (1 HP), S1-324-36074-213
Programmable EON ECM Motor (1 HP), S1-324-36074-213
SKU: S1-324-36074-213
York
SKU: S1-324-36074-213
Brand: York
$2,248.13 each
Backorder
Get it by Fri, Nov 13 - Mon, Dec 14
Backorder
Get it by Fri, Nov 13 - Mon, Dec 14
Compare
Product Image of XAB0148BA Parts - York Air Handlernot-to-sell-product
XAB0148BA Parts - York Air Handler
SKU: XAB0148BA
York
SKU: XAB0148BA
Brand: York
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Compare
Product Image of XAB0148QA Parts - York Air Handlernot-to-sell-product
XAB0148QA Parts - York Air Handler
SKU: XAB0148QA
York
SKU: XAB0148QA
Brand: York
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Compare
Product Image of XYAR1360 Parts - York Central Air Conditionernot-to-sell-product
XYAR1360 Parts - York Central Air Conditioner
SKU: XYAR1360
York
SKU: XYAR1360
Brand: York
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Compare
Product Image of Y13AC05M1KABBAA Parts - York Central Air Conditionernot-to-sell-product
Y13AC05M1KABBAA Parts - York Central Air Conditioner
SKU: Y13AC05M1KABBAA
York
SKU: Y13AC05M1KABBAA
Brand: York
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Compare
Product Image of XYAS13241A Parts - York Central Air Conditionernot-to-sell-product
XYAS13241A Parts - York Central Air Conditioner
SKU: XYAS13241A
York
SKU: XYAS13241A
Brand: York
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Compare
Product Image of XYPH1260AA Parts - York Heat Pumpnot-to-sell-product
XYPH1260AA Parts - York Heat Pump
SKU: XYPH1260AA
York
SKU: XYPH1260AA
Brand: York
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Compare
Product Image of Y13AN44A1KABBB Parts - York Central Air Conditionernot-to-sell-product
Y13AN44A1KABBB Parts - York Central Air Conditioner
SKU: Y13AN44A1KABBB
York
SKU: Y13AN44A1KABBB
Brand: York
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Compare
Product Image of Y13AN44A6IDABB Parts - York Central Air Conditionernot-to-sell-product
Y13AN44A6IDABB Parts - York Central Air Conditioner
SKU: Y13AN44A6IDABB
York
SKU: Y13AN44A6IDABB
Brand: York
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Compare
Product Image of Y13AN44C2KACBA Parts - York Central Air Conditionernot-to-sell-product
Y13AN44C2KACBA Parts - York Central Air Conditioner
SKU: Y13AN44C2KACBA
York
SKU: Y13AN44C2KACBA
Brand: York
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Compare
Product Image of Y13BN42A6ICNAAA Parts - York Central Air Conditionernot-to-sell-product
Y13BN42A6ICNAAA Parts - York Central Air Conditioner
SKU: Y13BN42A6ICNAAA
York
SKU: Y13BN42A6ICNAAA
Brand: York
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Compare
Product Image of Y13ES45M1KANBCA Parts - York Central Air Conditionernot-to-sell-product
Y13ES45M1KANBCA Parts - York Central Air Conditioner
SKU: Y13ES45M1KANBCA
York
SKU: Y13ES45M1KANBCA
Brand: York
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Compare
Product Image of XYPH1342AA Parts - York Heat Pumpnot-to-sell-product
XYPH1342AA Parts - York Heat Pump
SKU: XYPH1342AA
York
SKU: XYPH1342AA
Brand: York
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Compare
Product Image of XYPH1348AC Parts - York Heat Pumpnot-to-sell-product
XYPH1348AC Parts - York Heat Pump
SKU: XYPH1348AC
York
SKU: XYPH1348AC
Brand: York
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Compare
Product Image of Y14AS24A6IDFCBA Parts - York Central Air Conditionernot-to-sell-product
Y14AS24A6IDFCBA Parts - York Central Air Conditioner
SKU: Y14AS24A6IDFCBA
York
SKU: Y14AS24A6IDFCBA
Brand: York
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Compare
Product Image of Y14DX12A6EDNBAA Parts - York Central Air Conditionernot-to-sell-product
Y14DX12A6EDNBAA Parts - York Central Air Conditioner
SKU: Y14DX12A6EDNBAA
York
SKU: Y14DX12A6EDNBAA
Brand: York
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Compare
Product Image of Y1C10N966ANHAAAB Parts - York Central Air Conditionernot-to-sell-product
Y1C10N966ANHAAAB Parts - York Central Air Conditioner
SKU: Y1C10N966ANHAAAB
York
SKU: Y1C10N966ANHAAAB
Brand: York
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Compare
Product Image of Y13AN43C31AADA Parts - York Central Air Conditionernot-to-sell-product
Y13AN43C31AADA Parts - York Central Air Conditioner
SKU: Y13AN43C31AADA
York
SKU: Y13AN43C31AADA
Brand: York
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Compare
Product Image of Y13AN44A1AANEC Parts - York Central Air Conditionernot-to-sell-product
Y13AN44A1AANEC Parts - York Central Air Conditioner
SKU: Y13AN44A1AANEC
York
SKU: Y13AN44A1AANEC
Brand: York
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Compare
Product Image of Y13AN45A3IADCCA Parts - York Central Air Conditionernot-to-sell-product
Y13AN45A3IADCCA Parts - York Central Air Conditioner
SKU: Y13AN45A3IADCCA
York
SKU: Y13AN45A3IADCCA
Brand: York
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Compare
Product Image of Y13AX14A2IDHBA Parts - York Central Air Conditionernot-to-sell-product
Y13AX14A2IDHBA Parts - York Central Air Conditioner
SKU: Y13AX14A2IDHBA
York
SKU: Y13AX14A2IDHBA
Brand: York
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Compare
Product Image of Y13BN42C2OACBA Parts - York Central Air Conditionernot-to-sell-product
Y13BN42C2OACBA Parts - York Central Air Conditioner
SKU: Y13BN42C2OACBA
York
SKU: Y13BN42C2OACBA
Brand: York
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Compare
Product Image of Y13EN42A5IDNBAA Parts - York Central Air Conditionernot-to-sell-product
Y13EN42A5IDNBAA Parts - York Central Air Conditioner
SKU: Y13EN42A5IDNBAA
York
SKU: Y13EN42A5IDNBAA
Brand: York
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Compare
Product Image of Y13EN44A2AANEA Parts - York Central Air Conditionernot-to-sell-product
Y13EN44A2AANEA Parts - York Central Air Conditioner
SKU: Y13EN44A2AANEA
York
SKU: Y13EN44A2AANEA
Brand: York
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Compare
Product Image of Y13FC04A3MANDA Parts - York Central Air Conditionernot-to-sell-product
Y13FC04A3MANDA Parts - York Central Air Conditioner
SKU: Y13FC04A3MANDA
York
SKU: Y13FC04A3MANDA
Brand: York
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Compare
Product Image of Y14AE84E7CDGBAA Parts - York Central Air Conditionernot-to-sell-product
Y14AE84E7CDGBAA Parts - York Central Air Conditioner
SKU: Y14AE84E7CDGBAA
York
SKU: Y14AE84E7CDGBAA
Brand: York
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Compare
Product Image of Y14AN44A6IDABEA Parts - York Central Air Conditionernot-to-sell-product
Y14AN44A6IDABEA Parts - York Central Air Conditioner
SKU: Y14AN44A6IDABEA
York
SKU: Y14AN44A6IDABEA
Brand: York
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Compare
Product Image of XEM0220N140A Parts - York Furnacenot-to-sell-product
XEM0220N140A Parts - York Furnace
SKU: XEM0220N140A
York
SKU: XEM0220N140A
Brand: York
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Compare
Product Image of YCHD48S41S1 Parts - York Central Air Conditionernot-to-sell-product
YCHD48S41S1 Parts - York Central Air Conditioner
SKU: YCHD48S41S1
York
SKU: YCHD48S41S1
Brand: York
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Compare
Product Image of YCJD36S41S1A Parts - York Central Air Conditionernot-to-sell-product
YCJD36S41S1A Parts - York Central Air Conditioner
SKU: YCJD36S41S1A
York
SKU: YCJD36S41S1A
Brand: York
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Compare
Product Image of YCJD36S41S1HA Parts - York Central Air Conditionernot-to-sell-product
YCJD36S41S1HA Parts - York Central Air Conditioner
SKU: YCJD36S41S1HA
York
SKU: YCJD36S41S1HA
Brand: York
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Compare
Product Image of YCJD36S43S3A Parts - York Central Air Conditionernot-to-sell-product
YCJD36S43S3A Parts - York Central Air Conditioner
SKU: YCJD36S43S3A
York
SKU: YCJD36S43S3A
Brand: York
VIEW REPLACEMENT PARTS
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Compare
Product Image of YCJD42S21S2A Parts - York Central Air Conditionernot-to-sell-product
YCJD42S21S2A Parts - York Central Air Conditioner
SKU: YCJD42S21S2A
York
SKU: YCJD42S21S2A
Brand: York
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Compare
Product Image of YCJD48S43S3A Parts - York Central Air Conditionernot-to-sell-product
YCJD48S43S3A Parts - York Central Air Conditioner
SKU: YCJD48S43S3A
York
SKU: YCJD48S43S3A
Brand: York
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Backorder
Get it by Mon, Nov 16 - Thu, Dec 17
Resources
FAQs, Manuals & Videos
Articles
More About York

York is a manufacturer of residential and commercial HVAC equipment, including central air conditioners, heat pumps, gas furnaces, and air handlers, with a product history dating to 1874. Founded in York, Pennsylvania, York is now part of Johnson Controls and produces equipment across efficiency tiers from DOE-minimum single-stage models to high-efficiency variable-capacity systems. York's residential lineup includes the Affinity Series, LX Series, and entry-level lines covering heat pumps and air conditioners from 14.3 SEER2 through 19 SEER2. Select York products qualify for ENERGY STAR and are eligible for Inflation Reduction Act federal tax credits and rebates.

Product Lines

York Affinity Series Heat Pumps (YZV)

The York YZV Affinity Series is a variable-capacity communicating heat pump rated at 19 SEER2, using a variable-speed inverter compressor that adjusts capacity to match the home's load. The YZV qualifies for ENERGY STAR certification and may be eligible for IRA federal tax credits and utility rebates.

York LX Series Heat Pumps (YH6, YH2F)

York LX Series heat pumps cover the ENERGY STAR efficiency tier with two-stage (YH6, 16 SEER2) and 1-and-2-stage (YH2F, 15.2 SEER2) configurations. Both meet ENERGY STAR and CEE Tier 1 requirements and are eligible for IRA incentives. The YH6 provides reduced sound and tighter temperature control over single-stage models.

York Entry-Level Heat Pumps (YH2E) and Air Conditioners (YC2E, YC2F)

York entry-level models (YH2E heat pump 14.3 SEER2; YC2E air conditioner 14.3 SEER2; YC2F up to 17.5 SEER2) meet 2023 DOE minimum efficiency standards. The YH2E is designed for straightforward residential replacement projects. The YC2F steps up to two-stage capacity for larger tonnage and is ENERGY STAR rated.

York Residential Gas Furnaces

York residential gas furnaces are available in 80% and 90% AFUE configurations. High-efficiency York furnaces with variable-speed blowers and two-stage gas valves provide tighter temperature control and lower fuel use compared to single-stage, constant-speed models. York furnaces match with York split system equipment for AHRI-rated system combinations.

Why Contractors Specify York

HVAC contractors specify York because the product line covers the full range of residential efficiency tiers from DOE-minimum replacements through ENERGY STAR variable-capacity systems eligible for IRA federal tax credits. York LX Series and Affinity Series heat pumps qualify for ENERGY STAR and CEE Tier 1, giving contractors access to incentive-eligible products for customers pursuing IRA rebates. York is part of Johnson Controls. York furnaces and air handlers are designed to match with York split system equipment, simplifying system selection and supporting AHRI-rated matched system efficiency documentation.

How to Choose a York Product

The most important decision variable is the application efficiency target: DOE-minimum replacement, ENERGY STAR replacement, or high-efficiency variable-capacity installation. For DOE-minimum work, the YH2E (14.3 SEER2) and YC2E (14.3 SEER2) cover standard replacement. For ENERGY STAR-qualifying installations, the YH2F (15.2 SEER2) and YH6 (16 SEER2) meet CEE Tier 1 thresholds qualifying for IRA Section 25C credits. For maximum efficiency, the YZV Affinity Series (19 SEER2) uses an inverter compressor for load-matching. For furnace selection, match AFUE tier to energy cost sensitivity and climate.

FAQs

Where is York manufactured and when was York founded?
York was founded in York, Pennsylvania in 1874 and is now part of Johnson Controls. York manufactures residential and commercial HVAC equipment distributed through an authorized contractor and distributor network across North America.

What warranty does York offer on residential heat pumps and air conditioners?
York offers a 10-year parts limited warranty on registered residential products when installed by an authorized York contractor and registered within 90 days. Unregistered equipment typically carries a 5-year parts warranty.

What is the difference between the York YZV Affinity Series and the YH6 LX Series heat pump?
The YZV uses a variable-speed inverter compressor that continuously adjusts capacity, rated at 19 SEER2. The YH6 is a two-stage compressor rated at 16 SEER2, running at low or high capacity only. The YZV provides more precise temperature control at partial loads. The YH6 improves comfort over single-stage models at a lower upfront investment than the YZV.

What York heat pump qualifies for the IRA Section 25C federal tax credit?
York LX Series heat pumps (YH2F at 15.2 SEER2, YH6 at 16 SEER2) and the YZV Affinity Series meet ENERGY STAR and CEE Tier 1 requirements qualifying for IRA Section 25C tax credits. Eligibility depends on current IRS requirements.

Are York split system heat pumps compatible with non-York air handlers?
York split system heat pumps are designed to pair with York air handlers and furnaces for AHRI-rated matched system efficiency. Non-York air handlers can be used in some configurations, but AHRI-rated efficiency verification may not be available for the combination. Communicating York systems like the YZV require a compatible York communicating air handler or furnace.

How does SEER2 differ from SEER?
SEER2 is the 2023 DOE replacement for SEER, using a new M1 test methodology that results in ratings approximately 5 percent lower than equivalent SEER ratings. York equipment is rated in SEER2 under current DOE standards. The lower SEER2 number reflects the updated test standard, not a reduction in actual performance. York's current lineup runs from 14.3 SEER2 to 19 SEER2.