Diagnostics & Service Calls
We inspect the system, find the real cause, and explain your options before any repair begins.
Owner-Operated HVAC · Hershey & Hummelstown
Honest Heating & Cooling for Homes Across Hershey, Hummelstown & Harrisburg
Furnace not heating? AC not cooling? Keystone Property Service LLC is a local, owner-operated business. We diagnose the real problem, give you up-front pricing, and fix what actually needs fixing — no runaround, no pressure.
- Owner-operated
- Fully insured
- Up-front pricing
- Evenings & weekends — no extra fee
$120
Service Call
& Diagnostic
& Diagnostic
Josh DemkoOwner / Operator
Fully InsuredWork you can trust
Up-Front PricingApproved before we start
Hershey & HummelstownPlus Harrisburg & nearby towns
Why Keystone
Local HVAC Help Without the Runaround
When your heat or AC quits, you don't want a sales pitch — you want someone to figure out what's wrong and tell you straight. That's how Keystone Property Service LLC works. You deal directly with Josh Demko, the owner doing the work, not a call center or a rotating crew.
We're a repair-first business. If a part fix will get your system running properly, that's what we'll recommend. If a system is genuinely worn out, we'll tell you that too — and a replacement estimate is free, with no pressure to decide on the spot. Either way, you get clear pricing before any repair work begins.
- Repair-first. We fix what can be fixed before talking replacement.
- Up-front pricing. You approve the cost before we start.
- Evenings & weekends, no after-hours fees. We work when you're home, at standard rates.
- Local & fully insured. The homes we service belong to our neighbors.
Our Main Focus
HVAC Services for Hershey, Hummelstown & Nearby
Heating and cooling is what we do most — straightforward service for homeowners in Hershey, Hummelstown, Middletown, Harrisburg, Palmyra, and Elizabethtown.
Heating Repair
Furnace and heat pump repair — no heat, short cycling, odd noises, or rising bills. We diagnose first, then quote.
AC Repair
Warm air, weak airflow, or a system that won't start? We track down the cause and give you a clear price.
Maintenance & Tune-Ups
Seasonal tune-ups and inspections that keep your system efficient and help head off breakdowns.
Full Tune-Up with Coil Cleaning
A complete seasonal service including coil cleaning, performance checks, and adjustments.
Free Estimates & Quotes
Replacement estimates and installation quotes are free — no obligation, and an honest take on repair vs. replace.
Recent Ductless Mini-Split Installs
A look at real heat pump work — efficient Mitsubishi Electric ductless mini-split systems installed for local homeowners.
Common Calls
Common Calls We Handle
If any of this sounds like your system, give us a call — these are everyday jobs for us.
AC Not Cooling
Air conditioner running but the house won't cool down.
Furnace Not Heating
No heat, or the furnace won't keep up on cold days.
Heat Pump Issues
Heat pump not switching modes or struggling to keep temperature.
Strange Noises or Smells
Banging, rattling, buzzing, or an odd odor when the system runs.
Short Cycling
System turns on and off too quickly without finishing a cycle.
Weak Airflow
Vents barely pushing air, or some rooms never get comfortable.
Thermostat Issues
Thermostat unresponsive, inaccurate, or not controlling the system.
Maintenance & Tune-Ups
Seasonal check-ups and coil cleaning to keep things running right.
Beyond HVAC
A Few Other Things We Can Help With
HVAC is our main focus, but Keystone Property Service LLC also handles a handful of related property services. If you need a hand with any of these, just ask.
Water Heater Service & Installation
Service, repair, and installation for home water heaters.
General Property Maintenance
Practical upkeep and small repairs around the home.
Property Consulting
A straightforward second opinion on property and system condition.
Preventive Maintenance
Scheduled check-ups that help you avoid bigger problems later.
How It Works
A Simple, Up-Front Process
Three steps — and you stay in control of the decision the whole way.
-
1
Request Service
Call or send the service request form. Tell us what your system is doing and when you'd like service.
-
2
Get Diagnosis & Pricing
We diagnose the system, explain what's going on in plain language, and give you a clear, up-front price.
-
3
Approve the Work
Repairs begin only after you approve the price. No surprise charges, no pressure.
Pricing
Honest, Up-Front HVAC Pricing
Here's what our standard services cost. You'll always get up-front pricing before any repair work begins.
Service Call / Diagnostic
A full diagnostic visit — we inspect the system and pinpoint the problem.
$120
Additional Labor
Hourly labor for repair work beyond the initial diagnostic.
$100/hr
System Inspection / Maintenance Check
A focused check of your system's condition — good for catching issues early.
$120
Full Tune-Up with Coil Cleaning
Complete seasonal service with coil cleaning. Price depends on the system.
$180–$220
Holiday Service Diagnostic
Diagnostic service on holidays. Up-front pricing still applies.
$180–$200
Replacement Estimates
An honest assessment when it may be time to replace a system.
Free
Installation Quotes
A written quote for a new system — no obligation.
Free
Final pricing may vary based on system condition, parts, access, equipment type, and scope of work. You'll receive up-front pricing before repair work begins.
Service Area
HVAC Service in Hershey, Hummelstown & Harrisburg
Keystone Property Service LLC is local to central Pennsylvania. We service homes in Hershey, Hummelstown, Middletown, Harrisburg, Palmyra, Elizabethtown, and the surrounding communities.
Not sure if you're in range? Give us a call — if we can help, we'll tell you, and if you're outside our area we'll say so.
- Hershey
- Hummelstown
- Middletown
- Harrisburg
- Palmyra
- Elizabethtown
- Surrounding areas
An Honest Start
Local, Insured & Straightforward
Keystone Property Service LLC is a newer local business. Rather than invent reviews or claims, here's what's true today — and where real proof will go as it's earned.
Owner-Operated
Run by Josh Demko — the owner does the work and stands behind it.
Fully Insured
Keystone Property Service LLC is fully insured for the work we do, so you can have peace of mind on every visit.
[LICENSE INFO] — add a license number here if applicable, or remove this line.
Google Reviews
Customer reviews will be added here once they're available on our Google Business Profile.
View our Google Business Profile →Recent Work
See photos of the owner and our recent work in the section just below.
On the Job
A Look at the Work
A few photos from Keystone Property Service — the owner, and the heating and cooling work we do for local homeowners.
FAQ
Frequently Asked Questions
A service call and diagnostic is $120 and covers identifying the problem. Any repair work is quoted separately, and you approve the price before we begin. Final pricing can vary with system condition, parts, access, and scope of work.
We serve homeowners in Hershey, Hummelstown, Middletown, Harrisburg, Palmyra, Elizabethtown, and the surrounding communities — ZIP 17036 and nearby.
HVAC is our main focus, but we also help with water heater service and installation, general property maintenance, property consulting, and preventive maintenance. If you're not sure whether we can help, just ask.
We don't advertise around-the-clock emergency service. We do offer flexible scheduling, including evenings and weekends at standard rates, and we'll work with you to find a time that fits.
Yes — Keystone Property Service LLC is fully insured for the work we do.
No. The form sends us a service request. Keystone Property Service LLC will contact you to confirm availability, timing, and pricing before any work begins.
Request Service
Request Service in Hershey, Hummelstown & Nearby
Send a service request or call Josh directly. We'll get back to you to confirm timing and pricing — evening and weekend appointments are part of our normal schedule.
- Call or Text717-576-8416
- EmailKPSinfo26@gmail.com
- HoursEvenings & weekends available — no after-hours fees
- Service AreaHershey, Hummelstown & nearby
Keystone Property Service LLC
Heat or AC Acting Up? Let's Take a Look.
Local, owner-operated and fully insured — with up-front pricing before any repair begins.