The efficiency and comfort you need and the space you occupy influence the decision for the cooling products you get.
I have worked in office management for the past decade and have learned so much about choosing quality HVAC equipment with good SEER ratings that would produce high efficiency and last a long time.
Last summer, I was managing an office building and noticed that it would get sweltering though we had an air conditioning system. A meeting with a local air conditioning company technician left me thinking of the best unit for the particular office building. We chose a dual-fuel system. The benefits the unit offered were enough for me to make a decision. I hired an a/c workman to handle the a/c install. Besides providing indoor comfort, this unit can clean the air, so there is no need for an indoor air-purification system. Because the new system also has ducts running through the office, I received training from the a/c rep on changing the air conditioning filters without the assistance of a professional. They taught me primary a/c care, but some would have to be done by a professional to avoid frequent a/c repair. One of the advantages of this system is that it is quiet, and you barely notice its presence. It was also the first time I learned how to clean a washable filter.