Age of Lennox Heat pumps

[Dan Harris]

I'm trying to figure out the age of these heat pumps
The realtor said they are new, they sure don't look like new units.
The serial #s are 5605H07263 - 5605E 01858

Thanks

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[Daniel Leung]

I'm trying to figure out the age of these heat pumps
The realtor said they are new, they sure don't look like new units.
The serial #s are 5605H07263 - 5605E 01858

For Lennox products: 1st & 2nd Digits = Factory, 3rd & 4th Digits = Year, 5th Letter = Month (from A to M, A=Jan, I is not in use, M=Dec)

These heat pumps are 2005 August & May.