Applewood Air Conditioning Limited

I purchased the new townhouse from Tribute with Applewood Air Conditioning installed in Feb. 2014. In July 2014, I reported the Applewood air conditioning didn't make cool well. But they told me didn't find problem. Then my family took vacation and no chance to use more of A/C because the weather was not hot enough. I turned on A/C this month and found valve leaking under the outside machine, and they temperature cannot go down even 1 degree. That recalled me the ink was seen last summer but I didn't know what it was. I called Applewood but was told out of warranty and need to pay $169+HST to do the 1st onsite diagnose. I am the first owner, the product quality is too bad to be trust, neither the service quality. They didn't try to fix it at the first time, only let me observe. The hot weather only started this month, how can I try A/C during winter??