Tier III vs Tier IV cooling costs — real numbers?

Hey folks, I'm evaluating colocation options for a small production cluster and the pricing delta between Tier III and Tier IV facilities is significant (~$200/month difference for my 3U rack space).

Tier IV promises 99.995% uptime with dual everything, but my workloads are mostly batch processing with some API traffic—nothing mission-critical that can't tolerate 4-5 hours downtime per year.

Has anyone here actually needed that extra redundancy? Or is Tier III basically solid enough for most use cases? Wondering if I'm paying for overkill.

Also curious about actual power delivery differences. Does Tier IV really mean cleaner power, or is that marketing fluff?

Tier III is totally fine for your use case. I've run batch workloads in Tier III for years—the real question is whether YOUR app can handle a few hours of downtime, which you already answered yes to. Tier IV's redundancy is great if you're doing financial trading or healthcare stuff, but for batch processing? You're paying for peace of mind you don't need. That $200/month is $2,400/year that could go toward better hardware or backups instead.

Thanks for the reality check, rackpilot. Yeah, that's what I needed to hear—sounds like Tier III is the way to go then. Gonna save that $200/month and put it toward better monitoring/alerting instead.

One thing rackpilot didn't mention—Tier III uptime math is 99.67%, which translates to ~22 hours/year of acceptable downtime. If your batch jobs are scheduled, you might actually hit that ceiling. That said, for $200/month savings, I'd honestly do what you're doing: Tier III + solid redundancy at the application layer (load balancing, failover DNS, etc). The real risk isn't cooling—it's single points of failure you can architect around cheaply. Save the Tier IV premium for when you actually need 5 nines.

honestly tier III is fine if you can handle scheduled maintenance windows, just don't sleep on monitoring costs—they'll eat into those savings quick