Before you close on a home in Ventura County, run through this checklist for the three most expensive systems to repair — HVAC, plumbing, and insulation. A standard home inspection confirms these systems "turn on"; it rarely tells you whether they're sized correctly, code-compliant, or about to cost you thousands. Use the list below to know what to look for, then have a licensed technician verify the items that matter while the price is still negotiable.
The pre-purchase systems checklist
Print this or keep it on your phone for the walkthrough. Anything you can't confirm yourself is worth having a licensed HVAC and plumbing professional verify before closing day.
Heating & Cooling (HVAC)
- Age of the furnace, AC, or heat pump — and the date of last service
- Whether the system is correctly sized for the home (over- and undersized both fail early)
- Ductwork condition and sizing — crushed runs, disconnected sections, or undersized ducts
- Adequate return air (too little starves the system and kills efficiency)
- Asbestos-wrapped ductwork, common in older Ventura County homes
- Refrigerant type — older R-22 systems are increasingly expensive to service
- A clear, properly routed condensate drain line (a clog means water damage)
- Thermostat operation and any zoning
- Code compliance of any past installation or repair
- Visible rust, corrosion, scorching, or signs of prior overheating
Plumbing
- Water heater age, type (tank vs. tankless), and capacity
- Pipe material — galvanized or aging pipe often means a repipe is coming
- Water pressure — too low points to corroded pipe; too high can blow out fixtures
- A sewer-lateral camera scope for roots, cracks, and bellies (the costliest hidden surprise)
- Active or past leaks under sinks, around fixtures, and at the water heater
- Shutoff valves that actually operate
- Signs of previous water damage or amateur repairs
- Water quality — hard-water scale, discoloration, or rusty water
- Slow drains anywhere in the home
Insulation & Air Sealing
- Attic insulation depth and R-value vs. what's recommended for the climate
- Even coverage — no gaps, compression, or missing areas
- Air sealing at penetrations, top plates, and recessed lights
- Moisture, rodent contamination, or degraded/old insulation
- Whether attic ductwork is sealed and insulated
- Older-home hazards (e.g., knob-and-tube wiring near insulation)
Why your real estate agent may not request one
This isn't about bad agents — plenty are excellent and will encourage a specialist inspection. It comes down to incentives. An agent is generally paid only when the sale closes, so anything that might give a buyer second thoughts or delay the deal works against that incentive. The standard home inspection is broad by design: it's built to confirm that systems power on and broadly function, not to surface the kind of system-level detail that complicates a sale.
The result is that the most expensive repairs in a home — HVAC, plumbing, and the roof — are the very ones a generic inspection underweights. As co-founder Kevin Allen puts it: "Some of the most expensive repairs in your home come from your HVAC, your plumbing, and your roof." Once you close, that cost moves from "negotiable" to "yours." A focused, pre-purchase audit of these systems is how you keep the leverage on your side of the table.
HVAC, plumbing & insulation inspection vs. a standard home inspection
Kevin frames it with a question worth asking before you hire anyone: "Do you take your car to the gas station down the street that's a generalist in everything, or do you go see your cardiologist when you have a heart problem?" A general home inspector is the gas station — great for a quick once-over of the whole property. A licensed HVAC and plumbing professional is the cardiologist for the systems that quietly determine your comfort, your energy bills, and your repair budget for years. For the full reasoning on each, see our companion guides on getting an HVAC inspection before buying and a plumbing inspection before buying.
What a full AirWorks systems audit adds
Beyond the checklist above, our technicians go deeper than a topical pass is designed to: HVAC system and duct sizing, return air, and code compliance; a sewer-lateral camera scope on the plumbing side; and an honest read on insulation R-value and air sealing. You walk away with a clear, written picture of all three systems — what's solid, what needs attention, and what it would cost to fix. You can see the full range of what we evaluate across our HVAC and plumbing services.
Schedule your full HVAC, plumbing & insulation inspection
A licensed local technician — not a salesperson — tells you exactly what you're buying, before you close. Most of the time, if repairs are needed, we credit the inspection toward the work.
When to schedule it — and what it costs
The time to look is before you close, while the findings can still move the price or the repair list. In Kevin's words: "I believe that you should always know what you're buying in your home. An inspection before you close is relatively inexpensive, and most of the time, if there are repairs to be done, we will credit those inspections toward the repairs." If you're already holding a repair quote the seller's agent handed you, bring it to us for a free second opinion and we'll review it line by line, with no obligation.
Why we publish this: AirWorks was built on a simple idea — options, not ultimatums. We'd rather you walk into your new home knowing exactly what the HVAC, plumbing, and insulation really are, the good and the bad, and decide for yourself. An honest inspection hands you the facts; what you do with them is always your call.
Checklist reflects how AirWorks Solutions evaluates a home's systems before purchase — HVAC and duct sizing, return air, sewer-lateral camera scope, water quality, insulation R-value, and code compliance. Verify any California contractor license at the Contractors State License Board (cslb.ca.gov). For the full reasoning, see our HVAC inspection guide and plumbing inspection guide. AirWorks Solutions, CA LIC# 950716 — Family Run. Mom Approved.
Quick answers
What should a homebuyer's HVAC, plumbing, and insulation inspection check?
For HVAC: system age, correct sizing, ductwork, return air, refrigerant type, the condensate drain, and code compliance. For plumbing: water-heater age, pipe material, water pressure, a sewer-lateral camera scope, leaks, and water quality. For insulation: attic R-value, even coverage, air sealing, and moisture or contamination. A general home inspection touches the surface of these; a licensed technician verifies the parts that actually drive your repair costs.
Why didn't my real estate agent recommend a separate HVAC or plumbing inspection?
Often it comes down to incentives, not bad intent. An agent is generally paid only when the sale closes, so anything that could complicate or delay the deal works against that incentive — and the standard, broad home inspection rarely surfaces the kind of system-level detail that gives a buyer pause. Plenty of excellent agents do encourage specialist inspections. But the most expensive repairs — HVAC, plumbing, and the roof — are exactly the ones a generic 'does it turn on?' inspection underweights, and after closing that cost is yours.
Does a standard home inspection cover HVAC, plumbing, and insulation?
Only at the surface. A general home inspection confirms systems power on and broadly function. It is not designed to evaluate HVAC sizing, ductwork, and return air; to camera-scope the sewer lateral; or to assess insulation R-value and air sealing against spec. Co-founder Kevin Allen's analogy fits: a general inspector is the gas station down the street; for your most expensive systems you want the cardiologist.
Should I schedule a systems inspection before or after closing?
Before — while the findings are still negotiable. Once you close, every repair the inspection would have caught becomes yours to pay for. A pre-purchase HVAC, plumbing, and insulation inspection is relatively inexpensive, and most of the time, if repairs are needed, AirWorks credits the inspection toward that work.
How much does a full HVAC, plumbing, and insulation inspection cost in Ventura County?
It's relatively inexpensive compared with the repairs it can uncover, and AirWorks typically credits the inspection fee toward any repairs that follow. You get a clear, written picture of all three systems before you're locked in — call (805) 312-9539 to schedule.