dj3,You see the number 42 in the model number?
Divide it by 12 to get 3.5 ton.
Yes, now that you know this, you can tell how many tons in every unit, unless of course the numbers have faded.dj3,
so, you just get the 2 digit number in the middle and divide it by 12? is that the standard way to do it for every hvac system?
Bigger is not better when it comes to hvac. Advising to blindly put in a larger unit isn’t wise, as your new 3 ton unit could get connected to undersized duct and never put out 3 tons.I just had a 3 ton unit installed in my home and the number was 36, like others said it's divisible by 12 for 36,000 BTU's. :wink2:
My old unit that leaked out the freon through the A coil I think was 2.5 ton, but it was 36 years old.
This 3 ton unit works great and doesn't run as much as the 2.5 ton unit. Better to go with a tad more than you need for those 100+ degree days.
My 3 ton unit is suited for the 1900 square feet of my home and so is the duct work. 2.5 ton is not quite enough. :wink2:Bigger is not better when it comes to hvac. Advising to blindly put in a larger unit isn’t wise, as your new 3 ton unit could get connected to undersized duct and never put out 3 tons.
You want the unit to run, it’s most efficient that way.
Equipment isn’t sized via square footageMy 3 ton unit is suited for the 1900 square feet of my home and so is the duct work. 2.5 ton is not quite enough. :wink2:
That's not what my friends tell me that do this for a living.Equipment isn’t sized via square footage
Unfortunately they are misled. Experience sometimes means you’ve been doing things wrong a long time.That's not what my friends tell me that do this for a living.
Also I edited my post and added a useful trick of the trade. :wink2:
Perhaps you can enlighten me on how to do it right now that it's done and works very well...:wink2:Unfortunately they are misled. Experience sometimes means you’ve been doing things wrong a long time.
The suction line is supposed to be insulated. But it’s not a trick of the trade in how your referring it to.
Depending on the duct some will never put out enough airflow. Equipment speaking you still have 3 tons, but not in airflow.The big new 3 ton will always put out 3 tons of cooling BTUs but if the ducts are too small will freeze the indoor coil.
You cannot lose cooling because of duct sizing. It may not flow well but the capacity is still there.:smile:
This is not a new home actually built in 1966. Also how do you know how long my unit runs? More run time = more electric bill. My house cools nicely and my unit runs according to how hot and humid it is outside. Much like the furnace in the winter. I can tell it's more efficient than my old unit because it cools the house faster than the old unit. My old unit used to be on more than off on hot days. So far this one on the few hot days runs about 40% less. Never had a commissioning report and don't care to pay for one. The installer 40 years experience matched the A coil with the furnace/AC unit and he did a good job.Certainly
Basically, as your equipment gets larger in size it tends to short cycle. It takes 15-20 minutes of consistent runtime for the unit to reach its full capacity and efficiency. Increased runtime also removes humidity from the space, which doesn’t happen cycling the unit on and off.
Then there’s the fact that the vast majority of homes are built with undersized/inadequate duct. So that big new 3 ton unit, never actually puts out 3 tons of air.
When your unit was commissioned, and you received your commissioning/startup report, what was your CFM/static/CFM per ton?