What tonnage size is Lennox HS18-461-7P?

Answer 1

Lennox's older systems have their own code found between hyphens in the

model number.

211=1.5 ton

261=2 ton

311=2.5 ton

411=3 ton

461=3.5 ton

511=4 ton 651=4.5 ton

So, in the case of your example, you have yourself a 3.5 ton, or 42000 pounds.