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The Learning Center
Practical guides from our master plumbers, HVAC technicians, electricians, and water-quality specialists — written for homeowners in Wisconsin's lake country.
Twenty-four articles, a 34-term glossary, and a permits cluster — all written by the licensed pros who actually do the work in homes across Walworth, Waukesha, and Racine Counties. No fluff, no sales pressure, just the facts you need before you spend a dollar.
Don't know where to start? Learn covers the fundamentals. Compare is for the choose-between decisions. Act tells you what to do right now.
01
Learn
Plain-language answers to the questions homeowners actually ask before they call us. Start here.
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Learn
What is a water softener and do I need one in Walworth County?
If you have well water, hard scale on faucets, and laundry that won't get clean — yes, you probably do. Here's the plain-English answer.
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Learn
Why is my well water rusty? (Iron + manganese in Wisconsin wells)
If your faucets stain orange and the laundry smells metallic, you have iron in your well water. What to test, what to fix, and when to call.
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Learn
How does geothermal heating work in a Wisconsin lake home?
Ground loops, heat exchangers, and why a 55°F earth temperature beats a 5°F outdoor air temperature every January night.
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Learn
Heat pump vs furnace: which is right for southeast Wisconsin?
Modern cold-climate heat pumps actually work in our winters. Here's when they win, when they don't, and when a dual-fuel hybrid splits the difference.
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Learn
Understanding Focus on Energy rebates — Wisconsin homeowner's guide
Wisconsin's statewide efficiency program pays you back for high-efficiency HVAC, water heaters, and insulation. Here's how to actually claim it.
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Learn
How often should I service my furnace, AC, and water softener?
An annual checklist for every major home system — and which ones will fail early if you skip a year.
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Learn
What's the difference between a tankless and tank water heater?
Tanks store hot water; tankless heats on demand. Both have a place in a Wisconsin home — here's how each one actually works.
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Learn
Dock and pier electrical wiring on Geneva Lake: what to know
Lake-front electrical is its own code section. GFCI requirements, marina-grade enclosures, and what a licensed electrician will (and won't) sign off on.
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- 10 Pillar · Permits & Code ComplianceRead pillar →
Permits & code compliance for plumbing, heating, cooling, and electrical work in Walworth, Waukesha, and Racine Counties
Most water-heater swaps, panel upgrades, and HVAC changeouts require a permit in our three-county service area — and we pull every one of them for you.
02
Compare
Side-by-side breakdowns, methodology, and cost-vs-value. For when you're choosing between two options.
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Compare
Plumbing, HVAC & electrical pricing guide — estimated cost ranges
Transparent planning numbers for repairs, replacements, water heaters, generators, and four HVAC package tiers — before you schedule a free in-home estimate.
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Compare
Repair vs replace: when does it pay to keep an older HVAC system?
The honest math: repair cost ÷ system age. Plus the three failure modes that always tip the decision toward replace.
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Compare
Geothermal vs heat pump vs furnace: cost-of-ownership over 15 years
Real installed costs, real Wisconsin utility rates, and what each system actually costs to operate over its full lifespan.
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Compare
Reverse osmosis vs water softener: which water-quality system do you need?
Different problems, different solutions. Most well homes need both — here's how to tell which goes where.
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Compare
Tankless vs tank water heater: side-by-side for the lake-country home
When a tankless wins (small family, low usage). When a tank still wins (big family, simultaneous demand). And the venting question that breaks the tie.
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Compare
Whole-house generator vs portable: when each makes sense
Automatic transfer switches, fuel sources, and what really happens when the power goes out for three days in January.
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Compare
Choosing a local plumber: what to look for vs the metro chains
Licensing, response time, who actually shows up to your house, and why the truck on your driveway matters more than the billboard.
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Compare
York vs Lennox vs Bradford White: a contractor's honest comparison
We install all three. Here's where each brand wins, where each one's parts pipeline gets tight, and why your installer matters more than your brand.
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Compare
Iron filter vs UV vs softener: well-water treatment in Walworth County
Three different jobs. Most well homes need at least two of the three. Here's the diagnostic flow.
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03
Act
Decision-stage articles that route you to the right next step — a Free Second Opinion, a service call, or an emergency dispatch.
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Act When to call O'Leary: emergency plumbing checklist -
Act Should I get a second opinion on my HVAC quote? If the quote is over $5,000 or pressures you to decide today: yes. Here's how our apples-to-apples Free Second Opinion works.
Schedule a free review -
Act Annual maintenance plans explained — what's included + how to enroll Our plan covers HVAC, plumbing, AND water-quality system tune-ups. Here's what each visit includes and the priority-service guarantee.
See plan details -
Act How O'Leary handles permits + inspections so you don't have to We pull the permit, schedule the inspection, meet the inspector, and hand you the signed-off paperwork. Here's exactly what happens behind the scenes.
Request service -
Act Financing a new system through Synchrony: terms + how it works 12-, 24-, 36-, 60-, and 84-month options. Same-day approval. Here's what to expect from application to first payment.
View financing -
Act Free in-home estimates: what to expect from your O'Leary visit The 60-minute walkthrough: what we measure, what we ask, what we leave behind, and why we never quote sight-unseen.
Book your estimate
Cluster
Permits & Code Compliance
The pillar article covers the full landscape across Walworth, Waukesha, and Racine Counties. These three spokes dive deeper on the questions we get most often.
Reference
Glossary — 25+ terms defined plainly
Plumbing, HVAC, electrical, and well-water terms. Every article in the Learning Center cross-links into these definitions.
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