Is there a crawl space above the garage that you can get to from the house? If so, cut a hole in the garage ceiling between the joists and drop down. Afterwards, you can frame it in and make an access cover.
simple solution: build a time machine.
Nice try, but if that were the case, there would certainly be an access door to the house if they were connected.
How 'bout a vent up near the joists? It should be held in place by screws.
Any progress yet? Enquiring minds want to know.
Brian
Yes, yes, fill us in! 
try hiring someone really small…
Then have them sneak in through a small hole…
Or BREAK DOWN THE DOOR!
It’s probably old anyways… you could use a new door
Any progress? It’s getting cold in here.
No answer, 'yak?
Where is da love?
When you borrow the ladder to get to the window consider using a long pole, such as a telescoping pole to change light bulbs, instead of climbing through the window.
I like the idea of the door in the door. I’ve seen that in older buildings.
LOL. Sorry for the silence folks, I was out of town. (I’m touched y’all care so much!)
Well I was in a hurry to get the door open so I could put my car in before leaving town for Thanksgiving. Didn’t work, so my car was exposed to the cruel elements and my sprinklers (which I couldn’t turn off because the controls are in the garage). Ah well. Now that I just got back in town, I’m aiming to search my house exhautively (again) this weekend before going for the ladder. Maybe I’ll stumble across the remote… fingers: crossed.
And FYI, every company I spoke with said the same thing: without access to the door opener, they can’t really help me.
Back to the 1920’s Style Death Ray, then…
We’ve overlooked the most obvious solution. Christmas is approaching, so you could just ask Santa to get inside using that magical method of his.