Compare the highest-rated hvac professionals in Londonderry, New Hampshire. All contractors are licensed, insured, and verified through our rigorous screening process.
A premier, full-service HVAC contractor specializing in high-efficiency heating and cooling solutions tailored to New England's climate. They are a Carrier Factory Authorized Dealer, offering top-tier equipment for both residential and light commercial properties. Their team is NATE-certified and highly skilled in complex installations, including geothermal and ductless mini-split systems, alongside comprehensive maintenance plans.
A family-owned and operated HVAC company with deep roots in the Londonderry community. They are known for their reliable, honest service and expertise in repairing all brands of furnaces and air conditioners. They offer a strong emphasis on preventative maintenance plans to ensure system longevity and efficiency, which is critical for handling the harsh winters and humid summers. Their technicians are EPA-certified and background-checked.
Specializes in modern, energy-efficient HVAC system replacements and upgrades. They are a leading provider for heat pump installations, helping homeowners reduce their carbon footprint and energy bills. They conduct detailed home energy audits to identify inefficiencies in the building envelope and ductwork before recommending solutions. They are accredited by the BBB and prioritize clear, upfront pricing and financing options.
The HVAC market in Londonderry, NH, is driven by a humid continental climate characterized by cold, snowy winters and warm, humid summers. This creates a consistent, high year-round demand for reliable heating (primarily forced-air gas/oil furnaces and boilers) and cooling (central AC and increasingly, heat pumps). Homeowners prioritize energy efficiency due to high seasonal fuel and electricity costs, creating a strong market for system upgrades, heat pumps, and proper maintenance to ensure system reliability during extreme temperatures. The market is competitive with a mix of long-standing local family businesses and larger regional providers.
4.7+ star average from verified customer reviews
All contractors are properly licensed and insured
10+ years average experience in the industry
Familiar with Londonderry regulations and climate
Get answers to common questions about hvac services in Londonderry, New Hampshire.
For maintenance, early spring (for AC) and early fall (for heating) are ideal to ensure systems are ready for peak seasons. For full system replacements, the shoulder seasons of spring and fall are best, as HVAC companies in Southern New Hampshire are less overwhelmed than during the extreme summer heat or winter cold snaps, potentially leading to better scheduling and pricing.
While New Hampshire has no statewide mechanical code, reputable Londonderry contractors follow the latest International Residential Code (IRC) and best practices. Importantly, check for rebates from NHSaves, which offers incentives for installing high-efficiency heat pumps, furnaces, and air conditioners, and from your local utility, Unitil, which serves Londonderry and may have additional offers.
Londonderry's cold winters, with average lows in the teens, mean that a standard air-source heat pump may struggle below freezing. However, modern cold-climate heat pumps are an excellent, efficient option for our region. For maximum comfort and efficiency, many homeowners opt for a dual-fuel system pairing a heat pump with a gas furnace (where natural gas is available) to handle the deepest cold spells cost-effectively.
Prioritize contractors licensed by the State of New Hampshire (a "Master" or "Journeyman" license for gas fitting and refrigeration). Choose a company with a strong local reputation, proven experience with New England homes, and one that performs detailed load calculations (Manual J) specific to our climate, rather than just sizing by square footage. Verify they carry proper insurance and offer clear, written estimates.
Short-cycling (frequent on/off cycles) is often caused by a dirty air filter, an oversized system, or a faulty flame sensor. It's a common issue in older Londonderry homes where systems may have been originally oversized. This inefficiency stresses the equipment and increases heating costs, especially during our long heating season. A local HVAC professional can diagnose the specific cause, which often involves cleaning, adjusting airflow, or evaluating if the system is properly sized.