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\begin{figure}[H]
\centering
\begin{subfigure}[b]{0.45\textwidth}
\centering
\includegraphics[width=\textwidth]{Office.png}
\caption{}
\label{fig:IndoorTempOffice}
\end{subfigure}
\hfill
\begin{subfigure}[b]{0.45\textwidth}
\centering
\includegraphics[width=\textwidth]{Apartment.png}
\caption{}
\label{fig:IndoorTempApartment}
\end{subfigure}
\caption{This is a caption}
\label{fig:IndoorTemp}
\end{figure}