Mitsubishi mini split
 

Looking to put a Mitsubishi Mitsubishi ceiling cassette in enclosed lanai in my Gardenia (10 x 28). One conractor recommended 1 ton unit, another 1.5 unit. Anyone with a Gardenia that has done it?

One ton should be plenty large enough for 280 square feet, especially if the windows are double pane glass. If there is no insulation above the ceiling, I would definitely have at least six inches of blown-in insulation added.

Lanai Mini Split
 

We have a 254 sq ft, double pane enclosed lanai with additional insulation blown in. Installed in May, 2020, we went with Mitsubishi 1 ton and the ceiling cassette. We use the lanai daily, year around, and it's all working perfectly!

1 ton is more than enough. Perhaps still too big.
https://learnmetrics.com/ac-tonnage-calculator

Go with the larger size. My Gardenia has a bigger lanai (450 sq. ft.) and a 2 ton unit. These systems have variable speed compressors. For example, mine can ramp down to 0.5 tons and I suspect it does most of the time but can ramp up when needed.

Who have you gotten from? Wondering as we are thinking of doing the same. I have read good things on TOTV about Kalos and Munns.

I put mine in the Garage but we went with Munns, they did a great job! They were also the best price.

We had a Mitsubishi 1 ton split AC put in nine years ago in our Gardenia, 300 square foot, glassed in lanai. Works great and cools the lanai down quickly. Sometimes we turn it on in the afternoon for five hours or so. In the winter the heater works well. We had T&D install the ten heavy duty, well insulated, vinyl clad glass doors.

I thought you meant one of these! Didn't know they made them that heavy. :icon_wink: :1rotfl:

Very good advice. And pay up for the extended warranty if it is an option.

One ton is fine
 

We had 280 square ft single pain lanai. Morning sun only. One ton was fine. Even on hottest day it would get cold. We added insulation in the ceiling. As a heater it was awesome. Best thing we aver did. The lanai was our go to place all year around.

KALOS did ours. Great people.

Consider Sun Kool as they are highly recommended!!

Why don't you ask them for a manual J printout? Hopefully there capable of providing that! Guessing does not work in the trade! Only in cards!
A manual J is a specific formula to calculate heat and cooling loads!
Every house is different! Too small is sometimes better than too much! A/C is more about humidity control than cooling! Without lower humidity you will never feel comfortable, just cooler.

What are you be quoted for cost?
 

What has anyone paid for this?

If you need 1.5 tons of cooling for a 280 square foot room, that means that you would need a 10 ton unit for an 1800 square foot house. Most 1800 square foot houses have a unit that is less than 4 tons.