Boiler service is something you should engage with on at least an annual basis. If you get your boiler furnace service done at least once per year, then you can rely on it working for you as designed. When you get in touch with a service that can do this work for you, you need to ask them how much they will charge for this service.
They can give you a quote based on the specifics of the service that you require.
The best part about this is that you can end up doing some comparison shopping to see what kind of boiler furnace service you need to go with. It will help you create a better sense of what kind of fees you ought to expect to pay when you are getting this process done. Ask the technicians about how they will get into your furnace and how they will create something more useful and more operational for you than ever before. Speak to them about this and have a discussion about what you must do to create the kind of environment that you need to have to get the most use out of your home whenever you want.