Our van’s heating system isn’t working

Our van’s heating system won’t work for some reason and I don’t know what to do about it.

This is not the kind of problem that I am used to dealing with, but I can’t exactly just leave it alone and not deal with it at all! The weather started cooling down in earnest around here just a couple of weeks ago.

We had an unusually warm winter up until that point, but now it’s freezing cold outside. The temperatures outside are in the teens and twenties, and it doesn’t look like it’s going to start heating up again anytime soon. I have to be in the car a lot of the time because of my job, and so I need to make sure that I have a fully functioning heating system in my van. If the heating system isn’t working correctly, then that means that I’m going to be really uncomfortable while I’m trying to do my job. I know that I’m going to have to get the heating system fixed, but I don’t really know who I should take it to. The mechanic who used to fix stuff for me on my vehicles recently retired, and so now I am at a loss as to where I should actually go to get problems like my heating system fixed. I think that it might actually make more sense for me to take the van to an HVAC repairman instead! I know that those guys don’t usually work on heating systems in vans, but I’m feeling pretty desperate about getting this thing fixed.
a/c worker