Swap the unit right
the first time.
Free working tools and straight-talk guides for commercial rooftop unit (RTU) replacement — a 9-brand cross-reference, plus tonnage, curb adapters, replace-vs-repair, and heat sizing. Built by a contractor who's been on the roof for 25+ years, not behind a textbook.
The commercial side nobody else covers
Everyone and their cousin built a residential Manual J calculator. Nobody built the thing you actually need when you're standing on a roof next to a dead 10-ton package unit. That's this.
Contractors & estimators
Price a swap fast, size the unit, decide curb adapter vs. new curb, and put real numbers in front of the customer before you leave the roof.
Facility & property managers
Stop guessing whether that aging unit is worth one more repair. Get honest replace-vs-repair math you can defend to ownership.
Techs learning commercial
You can wire a residential split in your sleep. Packaged rooftop work is a different animal — this is where you pick it up.
Tools, guides, and a pro tier coming
Calculators that actually work
Five client-side tools — a 9-brand RTU cross-reference with submittal deep-links, plus tonnage, curb adapter, replace-vs-repair, and heat sizing. No sign-up, no paywall.
Open tools →
02 / GuidesField-tested write-ups
What blows up a swap budget, when you really need a curb adapter, permit reality by state, and how to size a replacement fast.
Read guides →
03 / ProTemplates & the pro tier
Estimating spreadsheets, curb cheat-sheets, and permit-by-jurisdiction guides. Join the waitlist for the paid toolkit.
See resources →
The Home Whisperer
Plain-talk home HVAC, by Gregory Frazier — 25 years in the field. The commercial roof is my day job, but I'm bringing back the homeowner column I wrote for a decade: why your house is clammy, whether your air is making you sick, what's living in the attic, and which gear is actually worth your money.
- Comfort, indoor air quality, and home building science
- Written for homeowners across MD, PA, DE, VA and FL
Why this exists
I've replaced more rooftop units than I can count across Maryland, Pennsylvania, Delaware, Virginia and Florida. The same avoidable mistakes cost crews money every week: wrong tonnage, a curb that doesn't line up, a unit that should've been replaced two repairs ago.
- Rules of thumb that hold up on real commercial buildings
- Curb and duct gotchas before you ever order steel
- Honest numbers you can hand straight to the customer
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One email, a couple times a month. A real swap from the field, a tool update, and one thing that would've saved somebody money. No spam, unsubscribe anytime.