Business Details
Emergency
services
Your Trusted HVAC Partner in Holtsville, NY
Since 1891, Marran Oil has been a family-owned leader in heating, cooling, and energy solutions on Long Island. Our five-generation legacy combines cutting-edge technology with personalized service, offering high-efficiency oil, gas, and solar heating systems, central air conditioning, and 24/7 emergency repair services. We prioritize customer relationships, treating clients like family while maintaining industry-leading expertise through rigorous technician training and state-of-the-art equipment.Our commitment to innovation includes patented heating systems, smart home integration, and the longest-running automatic oil delivery program in Suffolk County. With UL-listed security monitoring and a focus on sustainability, we deliver comprehensive comfort and safety solutions tailored to Long Island's unique climate challenges.
Services
Heating Oil Delivery
HVAC Installation
Security Systems
Boiler Maintenance
Air Conditioning Repair
Oil Tank Installation
Smart Thermostats
Emergency Services
Highlights and features
- 128 years of family-owned heating expertise since 1891
- 24/7 emergency dispatch center with rapid response
- Factory-trained technicians with no subcontractors used
- Patented System 2000 heating technology for maximum efficiency
- UL-listed security monitoring with smart home integration
Associations and certifications
- UL Listed
- CSAA 5 Diamond Rating
Services
Heating Oil Delivery
Our automatic heating oil delivery tracks usage patterns and weather conditions to ensure optimal fuel levels. Using advanced software calculations, we guarantee timely deliveries that prevent run-outs while maximizing efficiency. Customers benefit from fixed-price options and emergency delivery availability during extreme weather events.
HVAC Installation
We design and install high-efficiency heating and cooling systems tailored to each property's specifications. Our technicians perform free surveys to determine ideal system sizing and configuration. Specializing in both oil and gas systems, we offer the patented System 2000 for maximum energy efficiency and cost savings.
Security Systems
Our UL-listed security monitoring includes burglar, fire, and temperature failure detection with 24/7/365 coverage. We offer pet-safe motion sensors, heat failure alerts, and smart home automation integration. Basic systems are available at no cost with monitoring contracts.
Boiler Maintenance
Our comprehensive maintenance program includes annual inspections of all heating components, safety checks, and efficiency optimizations. Technicians perform safety drain pan inspections, electrical connection testing, and refrigerant level checks to ensure reliable winter operation.
Air Conditioning Repair
We service all types of air conditioning systems from basic ductless units to complex multi-zone systems. Our trained technicians handle refrigerant leaks, capacitor replacements, coil cleaning, and system diagnostics. Emergency repair services are available 24/7 during peak cooling seasons.
People
William R. Marran
Founder
Established Marran Oil in 1891 delivering kerosene by horse-drawn cart. Emphasized customer service as neighbors and friends. Laid foundation for family business philosophy focused on community relationships and quality service.
Francis Marran
Second Generation Leader
Modernized delivery with motorized trucks and built Patchogue River oil terminal. Introduced automatic oil delivery and heating systems. Emphasized infrastructure investment and innovation as core business principles during 1930s expansion.
Marcelle D. Marran
Business Leader
First Long Island businesswoman to lead company during Great Depression. Maintained customer focus with 'no such word as can't' philosophy. Successfully managed operations while raising four children after her husband's death.
William R. Marran II
Third Generation Leader
Navy veteran who implemented 24-hour radio dispatch system. Expanded post-war heating services and converted coal systems to oil. Introduced technological advancements that shaped modern emergency service protocols.
Jack Marran
Current Operator
Fourth-generation leader since 1995 with personal service approach. Maintains family tradition through direct customer contact and All-Risk Service Contracts. Expanded offerings to include security systems and smart home technologies.
Questions
What heating services do you offer?
We provide oil and gas heating systems, boiler installations, maintenance plans, and automatic oil delivery. Our patented System 2000 offers maximum efficiency for oil-fired heating applications across Long Island.
Are emergency services available 24/7?
Yes, our 24-hour dispatch center provides immediate assistance with trained technicians available at all times for heating system failures and other emergencies.
Do you service all of Long Island?
We serve all Suffolk County areas including Holtsville, Patchogue River, and the Hamptons. Our service territory covers residential and commercial properties across Long Island.
What payment methods are accepted?
We accept major credit cards, checks, and offer budget payment plans. Security monitoring services start at $24.99/month with contract options available for long-term savings.
What security features are included?
Our systems include burglar/fire monitoring, heat failure alerts, pet-safe motion sensors, and smart home automation. Basic packages are free with monitoring contracts starting at $24.99/month.
How does automatic oil delivery work?
Our software tracks usage patterns and weather data to schedule deliveries before low fuel situations occur. This ensures continuous heating without customer monitoring requirements during winter months.
