You and I both on the math!! My husband wanted to get the larger R-Com and I said the same thing! It would have been better during the hatch if we had the R-Com 40 with 20 eggs (babies wouldn't have been crawling over each other. I'm sure my husband would have wanted to fill it up though! He's as bad as I am with this!
The R-Com 20 is fairly quiet (it's self-adjusting heat and humidity constantly, but it's no more noisy than one of those small room humidifiers. We kept it in a spare bedroom so we didn't hear the little turning jingle (sounds like an ice cream truck) but I do believe there is a way of silencing it. We bought it from Strombergs. I spent quite awhile on-line comparing prices and found that their unit price worked out to be the least expensive because shipping was free. It comes with the universal tray only but I bought the 3 trays from another source but I'm not sure I would use the standard egg tray again. (Worked well for the legbars but my larger Ameraucana eggs and Cali White eggs wouldn't turn in it. I am setting
We hatched out Crested Cream Legbars and a few pure Ameraucanas and the balance are EE's (Ameraucana roo crossed with a California White, Buff Orp and Australorps. Trying to get some nice light green layers and increase egg size and production. One of my egg customers wants all green eggs. Lol.
I cleaned the R-Com and am ready to fire it up again tonight with more CCL's and Blue Ameraucanas. I think my husband will be working on coop #5 soon!!