do any good house cob?

All the Panhellenic houses do fall recruitment. It's up to the individual houses if they COB in the Spring. In my house, our national encourages to COB in the Spring for the exact reasons stated by the previous poster.
Depending on how many girls are already in the chapter vs what campus chapter size limits are (set by Panhel) will determine whether a chapter COB's or not.
The best way to COB is to be invited by the house. They will invite you to dinner, etc... So get to know girls in your classes, dorm, etc... that are in the houses you like and let them know you are interested in COB in the Spring.
It is very informal and nothing like fall recruitment. Good luck!

Alpha Phi, DZ are awesome houses participating in Spring Recruitment

You might see smaller houses doing a fall COB. If they did, it would make sense for them to look at their bid list and see if any girl they had on their list was cross cut and invite her. Or there might have been a great girl they liked but dropped from recruitment, they might reach out to her. This is an easy way for them to build up there numbers.
I have never heard of either DZ or Alpha Phi doing a fall COB. They always make quota and they don't need to. If either of these houses COB in the spring, generally its because they have members studying abroad and those members do not count towards house totals. I don't think Alpha Phi did COB last spring.

Phi Beta Chi does COB! Their recruitment is happening now. They have an event at star bucks at 7 pm I think. I went to their call out and they were pretty down to earth and nice. They said they were looking to grow since they are small. Idk if size is a factor for you. They should be on fb check them out.