John Kostynick Village Plumbing and Heating
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About John Kostynick Village Plumbing and Heating
John Kostynick Village Plumbing and Heating serves residential and commercial clients in Mineola and surrounding Nassau County communities. The business holds a 4.1-star rating from 10 customer reviews, reflecting a mixed but notable track sheet. As a full-service plumbing and heating contractor, the company handles everything from routine maintenance to complex system installations. Their service fleet operates Monday through Friday, 8 AM to 4:30 PM, providing scheduled appointments for standard needs.
This contractor distinguishes itself through Generac generator distribution and installation, keeping homes and businesses prepared during power outages. Their technicians are fully licensed and certified to handle plumbing, heating, and HVAC systems under one roof. The company also offers backflow testing to meet local municipal requirements and WaterCop water protection systems for flood prevention. These specialized capabilities extend beyond standard plumbing repairs into comprehensive home infrastructure protection.
Customer reviews highlight specific experiences with named technicians. Derrick, mentioned across multiple reviews, resolved a main sewer line stoppage and separately returned to a customer home to deliver forgotten change, demonstrating honest service. Reviewer Nan C credits Susan with navigating a complex gas permit issue that other contractors refused to handle, while Gary ensured smooth inspection coordination. One reviewer, Robert Zahner, praised the team's responsiveness and fair pricing after addressing multiple plumbing issues in a single visit.
What Customers Say
6 of 8 reviewers awarded 5 stars, with recurring praise for technician honesty, fair pricing, and responsiveness. Derrick and Susan received specific positive mentions for going beyond standard service expectations. Negative reviews cite billing disputes and communication issues rather than work quality.
Working Hours
| Sunday | Closed |
| Monday | 8 AM–4:30 PM |
| Tuesday | 8 AM–4:30 PM |
| Wednesday | 8 AM–4:30 PM |
| ThursdayToday | 8 AM–4:30 PM |
| Friday | 8 AM–4:30 PM |
| Saturday | Closed |
Services
Plumbing Repair & Installation
Diagnosis and repair of leaks, clogs, pipe replacements, and new fixture installations for residential and commercial properties.
Heating System Service
Furnace and boiler maintenance, repairs, and installation to keep homes warm during cold months.
HVAC Services
Air conditioning installation, maintenance, and repairs to ensure year-round indoor comfort.
Generac Generator Installation
Certified distributor and installer of Generac whole-house generators with professional setup and testing.
Backflow Testing
Municipal-required testing to prevent contaminated water from backflowing into the clean water supply.
WaterCop Water Protection
Automated water shutoff systems installed throughout the home to prevent flood damage from leaks.