Before you decide who is responsible, separate the three parties, because "does my realtor have a legal responsibility" has a different answer for each one, and that distinction is the whole case. The seller. In nearly every state a seller must disclose known material defects, usually on a statutory disclosure form. The word that decides your case is "known." A seller is not liable for a problem they genuinely did not know about. So the real question is not whether the furnace failed, it is whether they knew it had a history. Evidence of knowledge is what wins these claims: prior repair invoices, HVAC service history at that address, permit records, insurance claims, and neighbors. Your agent. Your agent owes you fiduciary duties, including disclosure of material facts they knew, and in many states facts they reasonably should have known, plus a duty of reasonable care and diligence. But an agent is not an inspector and generally is not liable for a latent defect they had no reason to know about. The narrower question is whether your agent saw a stain, heard a comment, or held a document showing a problem and did not pass it along. The home inspector. Honestly, when a defect was visible, this is often the most likely responsible party. A high-efficiency furnace and an aging roof are both squarely inside a standard inspection. Pull your report and read exactly what it says about each. Then read your pre-inspection agreement, because most cap damages at the inspection fee, which is a rude surprise. A number of states restrict or void those caps, including Alaska and California, where such caps have been treated as contrary to public policy, so ask an attorney in your state before assuming the cap holds. Now the technical part, which matters more than people expect. A condensing high-efficiency furnace produces several gallons of water a day, and that water has to drain somewhere. When the unit sits in an unconditioned attic and the temperature drops below freezing, the condensate trap or drain line can freeze, water backs up, and a safety switch shuts the furnace down. That is a very common failure mode on the first freezing night, and it points at installation and design more than at a concealed defect. It is also fixable, usually with heat cable and insulation on the trap and drain line, or by rerouting the drain inside. So here is what I would do this week. Get an HVAC contractor to put in writing what caused the shutdown, whether the installation is code compliant, and whether it was permitted. Pull permit history from the building department for both the furnace and the roof. An unpermitted install changes the conversation considerably. Check whether a home warranty came with the sale. Many cover HVAC in the first year. Photograph and date everything now, roof included. One fair point in the seller's favor, because you want a claim that holds up. A failure on the first night is suggestive, but it is not proof of concealment. The first hard freeze may simply have arrived that night. Claims built on documented evidence of knowledge hold up. Claims built on timing alone usually do not. Read your purchase contract too. Most require mediation before a lawsuit, and every state sets its own deadline for disclosure claims. Bring the disclosure form, the inspection report, the contract and the HVAC opinion to a real estate attorney licensed in your state before you spend money on repairs you may want documented first. I am Zoltan Peresztegi, a real estate professional working the Palos Verdes Peninsula, the South Bay and greater Los Angeles. Disclosure law varies by state and nothing here is legal advice, but if you tell me where the home is, I am glad to introduce you to a strong local agent from my network. Zoltan


