After the quality of your observing site, and the steadiness of the atmosphere, mirror quality is next most important. Odds are pretty good that a Zambuto mirror would have you covered there (which is why premium mirror makers charge a premium). Not to be alarmist, but can you verify the mirror is from Zambuto?
With a big scope, collimation might be easier than dragging it outside...
If you like DIY projects, fans aren't hard. You can install them to blow air at the back of the primary mirror, across the face of the primary mirror, or both. Simple wood working tools and some basic red-to-red and black-to-black DC wiring is all that's required. I think it's Mr. Lockwood who has been installing fans in front of primary mirrors, inside the shadow of the secondary mirror. A bit trickier, that, since you have to suspend the fan with wires (or something else thin and able to be tensioned) aligned precisely with the secondary mirror spider or you'll introduce more diffraction into your scope. Mr. Lockwood likes that better since it cools the reflective side of the mirror directly and serves as both cooling and boundary layer dispersal simultaneously.
We don't get big temperature gradients here on the 3rd Coast (it heats up in May and starts cooling in November, so about 1o per day ), so fans have not been very important to me. I have them on two of my four scopes, but hardly use them.