We woke up a couple days before the new year to a freezing cold house. Called Megacity in to look at the boiler furnace, and they suggested replacement of our 30+ year old unit. They said it could get done in two days, but then by the end of that first day they sourced a new unit, found a tech who was available, and got it done in mere hours on day #1; day #2 they upgraded our water heater at the same time to a more efficient model (an upgrade under our rental program), and also added some venting piping into our always-too-hot boiler room. Friendly and professional throughout, and willing to go many extra miles to help us.
The one thing I'd say would have been more helpful is if they'd called before arriving. The work took a few visits over two days to get it all done, and they were very eager to help us get our heat up and running again, but they showed up unannounced a few times, which was tricky managing our young toddler amid the loud noise and nap times. But when we asked the tech to come back a bit later, he was quite obliging.
Everything was done very well, very professionally, and promptly. Highly recommended.