I think he's happy with what he's got. Probably because he came from a cup in a fish store with a few oz of water, he'd probably be happy with anything! But yeah, these guys nailed it. You NEED and MUST GET a heater. Soon he will start suffering with the cold, if it's hot where you are now it's probably ok for the time being but they are tropical fish. I hate fish bowls in general so I'm biased but get yourself a nice 5 gal tank with heating and filtration and some plants, live or silk with a wee cave and he'll be building you bubblenests so big you'd never dreamed of!
He may be happy, but he hasn't lived in a bigger tank either. That could make him more happy. And even slightly bigger ones (like 3-5 gallons) aren't that expensive at all.
I'm always excited to see bubble nests. They mean that the fish is feeling secure. Heated water can go a long way to ensuring that your fish stays happy and healthy (and colorful). My biggest guy has a bubble nest stretched all the way around the rim of his 20-gallon AND all around the filter. He's a tiny architect. Each male has his own unique set of nest-making skills.
Wystan -- Pastel DeltaT Male -- 3 gallon
Abel Magwitch -- Wild-type RT King Male -- 20-gallon divided
Unnamed -- Red Butterfly? HM Male -- 20-gallon divided
Loki -- American Eskimo Dog -- 8 years
Kiara -- "Domesticated" Feline -- 5 years
Horatio -- Hermit Crab -- 5 years?