A practical guide to the “guts” of your house: what you have, what’s normal, and when to call a pro.
Most Westchester homes are older, patched, and upgraded in layers. If you don’t understand the main systems, you’re flying blind.
This guide gives you a simple map:
The major systems: heating, cooling, electrical, water/sewer, roof/envelope
What “normal” looks like
Typical lifespan ranges
Red flags you don’t ignore
Who you call when something’s off
1. Heating Systems
Westchester homes use a mix of boilers, furnaces, and (increasingly) heat pumps. Step one: know what you have.
1.1 Common Heating Types
Boiler + radiators/baseboards (hot water or steam)
Hot water: pipes to radiators/baseboards; quieter, more common.
Steam: big cast-iron radiators; can hiss/bang, feels “old house.”
Forced-air furnace
Metal ducts with floor/wall/ceiling registers.
Same ducts often used for AC.
Heat pumps / mini-splits
Wall or ceiling cassettes, often added later.
Can heat and cool; common in additions and retrofits.
1.2 What “Normal” Looks Like
House heats evenly without constant thermostat fiddling.
No strong fuel or exhaust smells inside.
No constant banging, grinding, or screeching.
Radiators/baseboards get warm, then cool, in predictable cycles.
1.3 Lifespan (Very Rough)
Boilers: ~20–30+ years with proper service
Furnaces: ~15–20 years
Heat pumps/mini-splits: ~12–15 years
Age isn’t everything, but near/over these ranges = higher risk. Budget accordingly.
1.4 Red Flags (Call a Pro)
Burning, fuel, or exhaust smells inside
CO alarm going off (get out first, then call)
Boiler/furnace rapidly cycling on and off
Leaking radiators, rusty stains on/under units
Boiler pressure constantly dropping or relief valve discharging water
1.5 Who to Call
Licensed HVAC contractor for boilers, furnaces, heat pumps
Plan on annual service for any fuel-burning equipment
2. Cooling Systems
Cooling is usually retrofitted into older homes and often the weak link.
2.1 Common Cooling Setups
Central AC – uses ducts, usually paired with a furnace or air handler
Mini-split / ductless – wall/ceiling units with outdoor condensers
Window/portable units – common where full AC was never added
2.2 What “Normal” Looks Like
System cools to set temperature without running nonstop
No persistent water dripping inside (some outside condensation is normal)
No strong mold or musty smell when AC kicks on
2.3 Red Flags (Call a Pro)
AC runs constantly but never reaches set temperature
Water stains or active drips around indoor unit or ceiling below
Breaker trips repeatedly when AC runs
Strong musty smell or visible mold around vents or air handler
2.4 Who to Call
Licensed HVAC contractor for central AC and mini-splits
Have them:
Clean coils and condensate lines
Check refrigerant and electrical connections
3. Electrical System
Electrical is where “it seems fine” can equal real risk. Older homes often have layers of upgrades and DIY.
3.1 Main Pieces to Identify
Main service size (amps) – 100A, 150A, 200A are common
Panel type and condition – modern breaker panel vs old fuse box
Wiring type – modern plastic-sheathed cable vs older cloth or knob-and-tube
3.2 What “Normal” Looks Like
Breakers rarely trip under normal use
No buzzing or crackling from panel or outlets
Outlets/switches feel solid, not loose or hot
GFCI outlets in kitchens, baths, garage, exterior
3.3 Red Flags (Call an Electrician)
Frequent breaker trips with normal appliance use
Lights dimming badly when AC or big appliances start
Warm or hot outlets, switches, or panel cover
Lots of two-prong outlets with no grounds
Visible knob-and-tube or crumbling cloth wiring
DIY-looking junctions: exposed wirenuts, open boxes, extension cords as permanent wiring
3.4 Lifespan & Upgrades
Panels can last decades, but:
Very old or recalled brands often need replacement
Undersized service (e.g., 60A, weak 100A in a big house) bottlenecks modern usage
3.5 Who to Call
Licensed electrician for:
Service and panel upgrades
Adding circuits, EV chargers, heavy appliances
Fixing unsafe or DIY wiring
4. Water, Waste & Plumbing
Water is usually the most expensive, sneaky enemy. Westchester has a mix of city water, wells, city sewer, and septic.
4.1 Know Your Setup
Supply: city water or private well
Waste: city sewer or private septic
Main shutoff: know exactly where it is and that it works
4.2 Hot Water Systems
Tank water heater (gas, oil, electric) – lifespan ~8–12 years
Indirect tank off boiler – often longer, but not forever
Tankless – efficient, compact, but needs maintenance
4.3 What “Normal” Looks Like
Consistent water pressure
No active drips under sinks, behind toilets, around water heater
No regular sewage smells in the house
Hot water arrives in reasonable time and stays hot
4.4 Red Flags (Call a Plumber / Septic Pro)
Any active leaks, even “small” ones
Rusty or bulging water heater, water on floor nearby
Very slow drains throughout the house (not just one sink)
Gurgling toilets or drains, recurring sewage smells
For septic:
Wet/soggy patches over leach field in dry weather
Backups or slow drains plus outdoor sewage smell
4.5 Who to Call
Licensed plumber for supply, fixtures, water heaters, interior drain issues
Septic company for pumping, inspections, leach field problems
5. Roof & Envelope
The envelope (roof, walls, windows, insulation) keeps weather out and comfort in. Once water gets past it, you’re buying new drywall and maybe mold remediation.
5.1 Roof Types
Common in Westchester:
Asphalt shingles (most common)
Slate (older homes; long life but needs specialized care)
Occasional metal or flat roofs on additions/porches
5.2 Roof Lifespan (Very Rough)
Asphalt: ~20–30 years, depending on quality and exposure
Slate: very long, but flashing and fasteners often fail first
5.3 What “Normal” Looks Like
No active leaks or growing stains inside
Shingles lying flat; no widespread curling/bald spots
Flashing (chimneys, skylights, walls) intact and sealed
5.4 Red Flags (Call a Roofer)
New or expanding ceiling/wall stains, especially after rain
Missing shingles or obvious damage visible from the ground
Heavy moss growth or sagging areas on roof plane
5.5 Gutters & Downspouts
Gutters should:
Flow freely during rain (no waterfalls over the edges)
Connect to downspouts that discharge away from foundation
Red flags:
Regular overflowing
Water pooling near the house
Rot at fascia or soffits near gutters
5.6 Windows, Doors & Insulation
Windows/doors should open/close reasonably and latch properly
Drafts at frames can often be improved with weatherstripping/caulk
Insulation:
Attic is usually the highest priority in older homes
Red flags: big ice dams, huge temp differences between floors
5.7 Who to Call
Roofer for roof, flashing, and often gutters
Insulation/energy specialist for attic/envelope upgrades
Window/door contractor for major replacements
6. Build a Simple House Systems Profile
Stop guessing. Create a one-page snapshot of your systems—your house’s “chart.”
6.1 What to Record
Heating: type, fuel, brand/model, age/installation year
Cooling: type (central, mini-split, window), age/year
Electrical: service size (amps), panel type, known wiring issues
Plumbing: city water vs well, sewer vs septic, water heater type/age
Roof: material, approximate age, known repairs
Insulation: attic type, known upgrades
6.2 How to Use It
Use it to identify near-term risks:
End-of-life equipment
Sketchy wiring
Old roof or no insulation
Then feed it into:
Homeowner Playbook – what to prioritize in Year One
Annual Home Calendar – when to service/check
Renovation Planning – what to upgrade during bigger projects
7. When to Stop Googling and Call a Pro
Some system issues are not DIY diagnostics. Call a qualified pro if you see:
Persistent electrical problems: hot outlets, frequent breaker trips, burning smells
Any combustion issues: CO alarms, soot backdrafting, strong fuel smells
Active water leaks, new interior stains after rain, or recurring dampness
Sudden changes: one area of the house no longer heating/cooling for no clear reason