Diamond HVAC

Investing in a new heating or cooling system is a significant decision for your San Jose home or business. At Diamond HVAC, we provide comprehensive residential and commercial HVAC installation services designed for optimal performance, energy efficiency, and long-term reliability. Whether you're upgrading an old unit, building a new property, or expanding your commercial space, our certified engineers handle the entire process with precision.We specialize in installing a wide range of systems,...

When your heating or air conditioning system breaks down, you need fast, dependable, and expert repair services. Diamond HVAC offers prompt and professional residential and commercial HVAC repair throughout San Jose. We diagnose and fix issues with all types of equipment, including air conditioners, heat pumps, furnaces, rooftop units, ductwork, and ductless split systems.Our team is specifically trained to tackle the complex problems that other companies struggle to resolve. We don't just treat...

The ductwork in your San Jose property is the circulatory system of your HVAC unit, responsible for delivering conditioned air to every room. Poorly designed, leaky, or damaged ducts can drastically reduce your system's efficiency, increase energy bills, and create uncomfortable hot or cold spots. Diamond HVAC provides expert ductwork installation, repair, sealing, and design services for both residential and commercial clients.Our services include installing new duct systems in homes undergoing...

Choosing a new heating or cooling system is a big decision, so we start with a detailed consultation and load calculation to size the unit correctly for your space. An oversized or undersized system wastes energy and wears out early. Our certified technicians handle the full job, from high-efficiency air conditioners, furnaces, and heat pumps to rooftop units for commercial buildings and ductwork. We take care of permits, follow manufacturer specifications and local building codes, and finish wi...

When your air conditioner stops cooling, we diagnose the cause instead of just treating the symptom. Our technicians check compressors, capacitors, refrigerant levels, electrical components, airflow, and thermostats to find the root problem and fix it so it stays fixed. You will get a clear explanation of what failed and transparent pricing before any work begins. We work on all major residential and commercial air conditioning equipment, and our crews follow strict site safety rules whenever th...

A heat pump can both heat and cool your home, and it can be an efficient choice for many properties. We install high-efficiency heat pumps sized to your space after a careful load calculation, since the right size matters for comfort and energy use. Our crew handles ductwork connections, electrical work, permits, and final testing as part of the job. We also install heat pump water heaters when that suits your needs. You can count on a complete installation that follows manufacturer specificatio...

Downtime costs a business money, so our commercial repair work is built around getting your operations running again quickly. We service rooftop units, commercial air conditioners, ductwork, and other building systems across the Bay Area. Our technicians use diagnostic tools to find the root cause of compressor, electrical, refrigerant, and airflow problems, and we aim to prevent repeat breakdowns. Our team is fully insured and follows strict health and safety protocols on every job site, so you...

A furnace that will not start or does not heat evenly needs prompt, careful attention, especially in cooler months. We inspect and repair all types of furnaces, looking at ignition, electrical components, airflow restrictions, and thermostat controls to find what is actually wrong. We explain each issue clearly and quote the repair before we start. Because a furnace is a safety-critical appliance, our technicians check the system thoroughly before returning it to service, so you can rely on it t...

Ductless mini split systems are a good option when a home has no existing ductwork or when you want heating and cooling in specific rooms. We design the layout around your space, choose the right indoor and outdoor units, and mount everything neatly with a clean line set. Our certified technicians handle the electrical connections, refrigerant work, and testing, and we secure any needed permits. You get individual zone control and quiet operation, with a system installed to manufacturer specs an...

When your heating or cooling fails at the worst possible time, we aim to respond promptly and get your system working again. Our technicians arrive ready to diagnose the problem with diagnostic tools and field experience, and they focus on the real cause so the repair holds. You will hear what is wrong and what it will cost before any work begins. We are fully insured, our team is security vetted, and we follow strict safety rules, so you can trust us in your home or business during an urgent si...

Heating, ventilation, and air conditioning affect comfort, energy costs, and air quality in every building, so we treat each system as a whole. Diamond HVAC handles installation, repair, ductwork, and maintenance for homes and businesses in San Jose, from residential furnaces and air conditioners to commercial rooftop units. Our certified team starts with an accurate assessment, explains your options clearly, and works to fair, transparent pricing. We build lasting relationships with our custome...