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Style 1:

The Date of Manufacture is in the fifth through eighth digits of the serial number and represents the year and week of production:


AUB U 08 05 00396

AUB U 08 05 00396

08 Year

05 Week


Style 2:

The Date of Manufacture is in the second through third digits of the serial number and represents the year and month of production:



5 5 A 1235501

05 Year (1995)

A Month (January)


05 1995

06 1996

07 1997

08 1998

09 1999


A January              G July

B February             H August

C March                 J September

D April                    K October

E May                     L November

F June                    M December



Style 3:

The Date of Manufacture is in the second through third digits of the serial number and represents the year and month of production:



5 P B 1264503

P Year (1984)

B Month (February)


A January

B February

C March

D April

E May

F June

G July

H August

J September

K October

L November

M December


A 1971

B 1972

C 1973

D 1974

E 1975

F 1976

G 1977

H 1978

J 1979

K 1980

L 1981

M 1982

N 1983

P 1984

Q 1985

R 1986

S 1987

T 1988

U 1989

V 1990

W 1991

X 1992

Y 1993

Z 1994

McQuay International, now known as Daikin Applied Americas, is a prominent manufacturer of commercial HVAC systems, including air conditioning solutions. Here are some key points about McQuay air conditioning systems:

1. **History and Reputation**:
   - McQuay International had a long-standing reputation in the HVAC industry for over 70 years before becoming part of Daikin Applied Americas.
   - The brand was known for its innovation, quality, and comprehensive range of HVAC products tailored for commercial and industrial applications.

2. **Product Range**:
   - McQuay offered a wide range of air conditioning systems, including air-cooled and water-cooled chillers, rooftop units, air handling units, and packaged systems.
   - Their products were designed to meet the specific cooling and heating needs of large-scale commercial buildings, hospitals, universities, and other industrial facilities.

3. **Energy Efficiency**:
   - McQuay air conditioning systems were designed with a focus on energy efficiency, incorporating advanced technologies such as variable-speed compressors, energy recovery options, and intelligent controls.
   - Many of their systems were engineered to meet or exceed industry standards for energy efficiency and sustainability.

4. **Features and Technology**:
   - McQuay systems often included advanced features like microprocessor controls for precise temperature and humidity control, integrated energy management systems, and remote monitoring capabilities.
   - They prioritized quiet operation, reliability, and ease of maintenance to ensure optimal performance and reduced lifecycle costs.

5. **Warranty and Support**:
   - McQuay provided robust warranty coverage and comprehensive support services through a network of trained technicians and service providers.
   - Their service offerings included preventive maintenance programs, technical support, and retrofit solutions to enhance system performance and efficiency.

6. **Integration with Daikin Applied Americas**:
   - In 2006, McQuay International was acquired by Daikin Industries, Ltd., and subsequently became part of Daikin Applied Americas.
   - This integration combined Daikin's global expertise in HVAC technology with McQuay's established reputation in the commercial HVAC market, enhancing product development and innovation capabilities.

7. **Legacy and Impact**:
   - McQuay's legacy continues to influence the commercial HVAC industry through Daikin Applied Americas, with a continued focus on delivering innovative and sustainable HVAC solutions tailored to meet the evolving needs of large-scale commercial and industrial customers.

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