Brown ale gravity problem

This is only my second batch and I tried looking through the threads to find a similar case but found nothing to what's happening so here it is,

My beginning gravity 1.042 after 1 weeks it was only at 1.030 there was minimal bubbling but if I slightly pushed in the cover there was pressure so I left it another week, reading was 1.021 so I gave it another week and it the same, airlock has had no pressure in it, should I or can I pitch another yeast or what, house temps are cold though so thats why I've waited it out. Any suggestions!

How cold? Pitching more yeast won't help if its way to cold.

55-60 house temp, I put it over a heat vent so that it warms it up when the heat kicks on so it reads 62-64

Might want to try the ghetto rig of puting a cardboard box over the fermenter and heater vent. Give the fermenter a gentle swirl too. Getting an ale yeast restarted is a pain as it is. You really want to get closer to 70 degrees to help it out.