Learn · Compare · Act
The On Time Learning Center
Honest HVAC education from a Waukesha County contractor who is still in the field. Shane Herro (Owner & Lead Tech) writes and reviews everything here, with notes from the On Time Heating & Cooling team. Three tiers, one mission: help you understand the system in your home, compare your options without a sales pitch, and know exactly what to do next.
Intent 1 · Education · 28 guides
Learn
Answer-first, no-pitch explainers. What it is, how it works, what can go wrong, and when to call a professional.
Furnace & Heating Basics
How gas furnaces actually work, what the ratings mean, and which warning signs matter in a Wisconsin winter.
Air Conditioning Basics
Central AC explained without the jargon — how it moves heat, what SEER2 means here, and why systems freeze up in July.
Heat Pumps in Wisconsin
Cold-climate heat pumps are real options for SE Wisconsin now. What works, what doesn't, and when the math pays off.
Ductless Mini-Splits
Additions, sunrooms, bonus rooms over the garage, and homes without ducts — where ductless wins and how zoning works.
Indoor Air Quality
MERV, HEPA, UV, ERVs, and winter humidity — which upgrade actually helps which problem, without the sales pitch.
Boilers & Hydronic Heat
Hot-water heat is common in older Wisconsin homes. How boilers differ from furnaces and when repair still makes sense.
Duct Cleaning, Honestly
When duct cleaning is worth paying for, when it isn't, what it costs here, and how to spot bait-and-switch specials.
Permits, Codes & Inspections
Mechanical permits, Wisconsin code, the 2026 refrigerant transition, and what unpermitted work costs you at resale.
- HVAC Permits & Code in Waukesha County: What Does Your Project Need?
- Do You Need a Permit for a Furnace Install in Waukesha County?
- Do You Need a Permit for an AC Changeout in Waukesha County?
- The 2026 A2L Refrigerant Transition: What Does It Mean for Your Next Install?
- What Happens If HVAC Work Isn't Permitted?
Intent 2 · Evaluate · 10 guides
Compare
Side-by-side breakdowns, cost/value frameworks, and how to pick the right system for a Wisconsin home.
Buying & Replacement Guides
Side-by-side decisions for Waukesha County homes — furnace vs. heat pump, repair vs. replace, and how to read a quote.
- Furnace + AC, Heat Pump, or Dual-Fuel: Which Path Fits a Waukesha County Home?
- Repair or Replace? When to Fix an Aging HVAC System and When to Move On
- What Does a Properly-Sized HVAC Quote Look Like (and What Are the Red Flags)?
- Single-Stage vs. Two-Stage vs. Variable-Speed: What Do You Actually Feel?
Equipment & Install Tiers
How we choose equipment (brand-neutral), what install tiers actually change, and how warranty coverage really works.
Energy & Operating Costs
Operating-cost math on We Energies rates, the Focus on Energy rebates worth chasing, and the truth about 0% financing.
Cost guides
What HVAC work really costs here
Job-by-job pricing deep dives for SE Wisconsin — repairs, replacements, tune-ups, and duct cleaning — anchored to the same published ranges as our instant pricing tool.
Browse the cost guidesIntent 3 · Next step · 9 guides
Act
One clear next step with full transparency — what a visit includes, what membership buys, and how the offers stack.
Repair vs. Replace Decisions
Your next step when a system is down or a quote feels wrong — free second opinions and honest diagnostics.
Membership & Maintenance
The On The Dot Club line-by-line: what $25/month buys, why two tune-ups is the baseline, and the owner direct line.
Financing & Promotions
Wisetack 0% financing, current promotions that are always real, and how install offers stack together.
Decision aids — no sales pitch.
These run client-side; nothing you enter is sent anywhere unless you press a "Contact us" button. Pull the sliders, change the inputs, see real numbers.
Decision aid
Heat-pump-for-Wisconsin
Dual-fuel break-even math, 1-yr and 10-yr cost comparison, SE-WI climate baseline.
Sizing tool
HVAC sizing estimator
Ballpark BTU/h and AC tonnage range for your home — sanity-check any quote before you sign.
Lead path
Free second opinion
Send us another contractor's quote. We review it line by line — free, no obligation.
Permit pilot
Do you need a permit?
Yes — a mechanical permit is required.
Wisconsin DSPS SPS 343 requires a mechanical permit for furnace, AC, heat pump, boiler, water heater, mini-split, and most duct changeouts. We pull the permit as part of the install — you don't have to.
Typical fee in Waukesha: $90–$180. Inspector turnaround: 5–10 business days.
Source: Wisconsin DSPS SPS 343 — Mechanical Code (Chs. SPS 364). Educational, not legal advice; confirm with your local building department. Placement: learning-center.
Look up an HVAC term
SEER2, AFUE, MERV, A2L, ERV, makeup air, BTU… The On Time HVAC Glossary defines every term the Learning Center references in plain English, with the brand-neutral framing we use on a service call.
Open the glossaryReady for an honest next step?
Free second opinions on outside-company HVAC diagnoses. 24/7 emergency service. Owner direct line for On The Dot Club members.