Words like "appalling", and "disgraceful" come to mind as I write this review, detailing my personal experience with the dirty business practices I was just subjected to.I started with A-1 in March of 2012, on a monthly service contract, where they would change the filters in my 12 roof units every month.Come June, when the weather got really hot, the units weren't keeping up. As an experiment, to keep these things running as smoothly as possible, I asked if we could amend our contract to change the filters every 2 weeks instead of every 4, to insure maximum airflow. They said yes, and quoted me a much higher price because it was double the work. I understood and agreed, so they tore up the old contract, and wrote me a new one.(Ultimately, it didn't make any difference at all in the efficiency of the units, so in retrospect, it was a bad idea.)So we rode it out, almost until the end of the year, but oddly, they didn't show up for either of their scheduled December visits, then called today, (on 1/11) to schedule the filter change. (Mind you, I pre-pay for changes every 2 weeks, and as of today, they haven't been here in 6 weeks!!)OK, so I go up on the roof and check the filters, to see if they were clogged after 6 weeks without a change, and they were actually very clean. In fact, they probably don't need to be changed again for another couple of weeks.So I told A-1 that they didn't need it, and that I'd like to switch my service back to monthly, being that we are essentially changing new filters every 2 weeks, and that was wasteful and unnecessary. They told me they couldn't do that, because I signed a bi-weekly contract, and that I had pre-paid through April.I told them that we could switch to monthly, and just extend the pre-paid contract to out a bit so that everything was equal. (Same number of filter changes, just over a longer duration)They told me that they couldn't do that, because I had signed a contract. So the customer's actual needs did not matter here, they had a signed contract.Mind you, they had no problem amending the contract last June, when doing so meant more money for them. So it is something that they CAN do, they are just choosing not to.I am so disappointed in how utterly dirty this was to do to me, that I am abandoning the money that I had pre-paid them through April, and firing them on general principle.So they can keep my Jan-April money, and since they never showed up in December, I suppose they got over on me there too.But life is long, a different company will enjoy my money for the rest of my life.